Identifying Chevy engines

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==Block casting numbers and codes==
 
==Block casting numbers and codes==
 
[[File:S-bbc block id.jpg|thumb|500px|Locations of Chevy V8 block ID numbers and codes]]
 
[[File:S-bbc block id.jpg|thumb|500px|Locations of Chevy V8 block ID numbers and codes]]
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One of the easiest way to identify a Chevrolet engine is by the casting number (c/n) that is cast into the castings (not stamped). [[Chevy engine casting numbers]] has several sites that are useful. The Chevy V8 block casting number is generally atop the transmission mounting area of the block. The date code will usually be found in the same area, sometimes on the opposite side from the casting number, but not always.  
+
One of the easiest way to identify a Chevrolet engine is by the casting number (c/n) that is ''cast'' into the castings (not stamped). '''[[Chevy engine casting numbers]]''' has additional info including links to several sites that have casting numbers broken down to application, etc.  
  
−
It is common to use just the last three numbers of the c/n when dealing with casting numbers, i.e. block c/n 10243880 would be called an "880" block. Usually the last three numbers aren't repeated but there are cases like the SBC head c/n 462 that- for some unknown reason- was reused 5 times! Fortunately this is rare.
+
The Chevy V8 block casting number is generally atop the transmission mounting area of the block. The date code will usually be found in the same area, sometimes on the opposite side from the casting number, but not always.
 +
 
 +
{{Note1}}It is common practice to use just the last three numbers of the c/n when dealing with casting numbers, i.e. block c/n 10243880 would be called an "880" block. Usually the last three numbers aren't repeated, but there are cases like the SBC head c/n '''''462''''' that- for some unknown reason- was reused ''5'' times! Fortunately this is rare.
 
<br style="clear:both"/>
 
<br style="clear:both"/>
 +
 
===SBC engine casting numbers===
 
===SBC engine casting numbers===
−
{{Note1}} The Mortec site is no longer available. As of 05:40, 25 June 2012 (MDT) Mortec is unavailable via waybackmachine. The casting numbers from Mortec have been posted at [http://forums.corvetteforum.com/c3-tech-performance/2916259-mortec-is-gone-get-your-chevy-casting-s-while-there-hot.html '''corvetteforum.com''']. The Mortec info is also listed at the bottom of this page.
+
*[http://www.mortec.com/castnum.htm Small-Block Chevy V8 Casting numbers] by Mortec
−
*[http://www.nastyz28.com/sbchevy/sblock.html smallblock info] from nastyz28.com  
+
*[http://outintheshop.com/faq/casting/castings2.html Chevy BB and SB casting number "go-to" site] from outintheshop.com
 +
*[http://www.nastyz28.com/sbchevy/sblock.html Smallblock info] from nastyz28.com  
 
*[http://www.73-87.com/chevy_ids/sbcid2.htm SBC ID] from www.73-87.com
 
*[http://www.73-87.com/chevy_ids/sbcid2.htm SBC ID] from www.73-87.com
−
*[http://www.classictruckshop.com/castgm_smblock.asp SBC casting numbers] from classictruckshop.com
+
*[http://www.classictruckshop.com/castgm_smblock.php SBC casting numbers] from classictruckshop.com  
 +
*[http://chevellestuff.net/qd/block_casting_by_year.htm Chevelle-specific] block casting number info
 
*[http://www.inliners.org/becks/BCN2.html Inline engine casting numbers] from inliners.org
 
*[http://www.inliners.org/becks/BCN2.html Inline engine casting numbers] from inliners.org
  
 
===BBC casting numbers===
 
===BBC casting numbers===
 +
*[http://www.mortec.com/bbc.htm Big Block Chevy V-8 Casting Numbers] by Mortec
 
*[http://www.nastyz28.com/bbcmenu.php Big Block Chevy Engine Parts Identification] from nastyz28.com
 
*[http://www.nastyz28.com/bbcmenu.php Big Block Chevy Engine Parts Identification] from nastyz28.com
 +
*[http://chevellestuff.net/qd/block_casting_by_year.htm Chevelle-specific] block casting number info
  
 
==Suffix codes==
 
==Suffix codes==
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Suffix codes are stamped into a small boss on the front passenger side of the block where the head and block meet. There will sometimes be two lines of numbers and letters, later engines had just one line of numbers and letters.<br>
+
Suffix codes are stamped into a small boss on the front passenger side of the block where the head and block meet. There will sometimes be two lines of numbers and letters, later engines had just one line of numbers and letters.
  
−
*[http://chevymania.com/partsid/suffix.cfm?block=Small SBC suffix code list] from Chevymania.com
+
Small block Chevy engines used different size pads for the engine suffix/partial VIN. Mid '70s-up blocks use the short, fat pad (top example in the picture below). Early engines use the middle pad. Blocks from the '60s through the mid '70s use the bottom pad.
−
*[http://chevymania.com/partsid/suffix.cfm?block=Big BBC suffix code list] from Chevymania.com
+
 
−
*[http://www.nastyz28.com/chevy-engine-code-stampings.php Suffix and VIN codes] from nastyz28.com
+
[[File:Suffix pads.jpg]]
 +
 
 +
Beginning about 1969 the suffix code became (mostly) three characters instead of one or two.<br>
 +
 
 +
*[http://chevymania.com/partsid/suffix.cfm?block=Small SBC suffix code list] (from Chevymania.com)
 +
*[http://chevymania.com/partsid/suffix.cfm?block=Big BBC suffix code list] (from Chevymania.com)
 +
*[http://www.nastyz28.com/chevy-engine-code-stampings.php Suffix and VIN codes], including many truck codes (from nastyz28.com)
  
 
==Date code==
 
==Date code==
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These flat tappet blocks '''''may''''' have the provisions for a roller cam (i.e. bosses present and drilled/tapped for the spider and for the cam plate, etc.), but also may '''not''' be equipped with the drilled and threaded bosses needed to use a factory roller valve train. In any event, these blocks originally had a flat tappet cam and non-roller lifters, no spider, and no cam thrust plate. These blocks are fine if you don't care about the roller cam.  
 
These flat tappet blocks '''''may''''' have the provisions for a roller cam (i.e. bosses present and drilled/tapped for the spider and for the cam plate, etc.), but also may '''not''' be equipped with the drilled and threaded bosses needed to use a factory roller valve train. In any event, these blocks originally had a flat tappet cam and non-roller lifters, no spider, and no cam thrust plate. These blocks are fine if you don't care about the roller cam.  
  
−
'''Note:''' There is a flat tappet block and a roller block that both end with the numbers 148. 14101148 is a flat tappet truck block, 14011148 is a roller provisioned block.  
+
{{!}} There is a flat tappet block and a roller block with casting numbers that ''both'' end in '''148'''. '''14101148''' is a flat tappet truck block, '''14011148''' is a roller provisioned block.
 +
 
 +
===Vortec block cylinders===
 +
The newer Vortec era blocks (1996-up) have a slightly shorter bore at the bottom, nearest the cam tunnel, as shown below left. This isn't a problem in most cases, but if a stroker crank is being considered, this should be looked into to be sure there'll be no issues due to the lack of piston support at BDC.
 +
 
 +
[[File:SBC BORE DEPTH 002.jpg|left]]<br style="clear:both"/>
  
 
==SBC Head casting numbers==
 
==SBC Head casting numbers==
Line 72: Line 90:
  
 
On the 400 SBC and externally balanced stroker engines, an OEM damper will have a scalloped portion to the outer ring which is easily seen. Aftermarket dampers usually use a bolted on counterweight, which is also usually easily seen.
 
On the 400 SBC and externally balanced stroker engines, an OEM damper will have a scalloped portion to the outer ring which is easily seen. Aftermarket dampers usually use a bolted on counterweight, which is also usually easily seen.
−
[[File:Sbc400balancer.jpg|thumb|300px|left|OEM 400 balancer. Note scalloped outer ring]] <br style="clear:both"/>
 
  
−
===BBC===
+
Not as easily seen is the gap or void in the SBC 400 main bulkhead webbing.
 +
[[File:Sbc400balancer.jpg|thumb|300px|left|OEM 400 balancer. Note scalloped outer ring]] [[File:Sbc400main web.jpg|thumb|400px||right|Void in 400 main webbing]]
 +
<br style="clear:both"/>
 +
 
 +
==BBC==
 +
 
 +
===Damper/balancers===
 
The 396/402 and 427 ci BBC engines were internally balanced. The 454 BBC engine is externally balanced. The 454 can be ID'd by the balancer having the inner hub cast with an integral counterweight (see image below). A 454 will also have a different flexplate/flywheel, having an added counterweight that is missing from the other displacement BBC engines. Like the SBC aftermarket dampers, the counterweight of a 454 damper might be bolted to the hub.
 
The 396/402 and 427 ci BBC engines were internally balanced. The 454 BBC engine is externally balanced. The 454 can be ID'd by the balancer having the inner hub cast with an integral counterweight (see image below). A 454 will also have a different flexplate/flywheel, having an added counterweight that is missing from the other displacement BBC engines. Like the SBC aftermarket dampers, the counterweight of a 454 damper might be bolted to the hub.
  
 
[[File:Bbc 454 damper.jpg|thumb|left|500px|BBC 454 balancer with inner ring scalloped]] <br style="clear:both"/>
 
[[File:Bbc 454 damper.jpg|thumb|left|500px|BBC 454 balancer with inner ring scalloped]] <br style="clear:both"/>
  
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==BBC notched bores==
+
===BBC notched bores===
 
A BBC block may have bores notched to clear the intake valves. Not present on all BBC engines.
 
A BBC block may have bores notched to clear the intake valves. Not present on all BBC engines.
 
[[File:BBC 454 BLOCK NOTCHED BORES.jpg]] <br style="clear:both"/>
 
[[File:BBC 454 BLOCK NOTCHED BORES.jpg]] <br style="clear:both"/>
  
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==BBC external cues for 2- or 4-bolt bottom end==
+
===BBC external cues for 2- or 4-bolt bottom end===
 
While not 100%, a Mark IV BBC engine can sometimes be ID'd for being a 2- or 4-bolt bottom end by looking above the filter mount:
 
While not 100%, a Mark IV BBC engine can sometimes be ID'd for being a 2- or 4-bolt bottom end by looking above the filter mount:
 
[[File:Bbc 4-bolt vs 2-bolt fittings id.jpg|550px]] <br style="clear:both"/>
 
[[File:Bbc 4-bolt vs 2-bolt fittings id.jpg|550px]] <br style="clear:both"/>
  
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==Tall deck BBC==
+
==396 block boring==
−
The 10.2" deck height tall deck BBC was made in two different sizes: 366 and 427 cid. These engines were made to stand up to heavy duty use like bus and dump truck, etc. right up to where a diesel would be used. The tall deck height was to facilitate the 4 ring piston ring pack used with these engines. The bottom ends were forged and the rods were heavy duty-and heavy in weight.
+
Some 396 blocks will take an overbore to 4.250". One way to tell if the block has sufficient metal to do this is by removing a center freeze plug from the side of the block, then see if a ~1/4" wooden dowel (a pencil will do) will fit in between the cylinder jackets. If it fits the walls are probably not thick enough to bore to 4.250".
 +
 
 +
{{Note1}}This is not meant to be a replacement for sonic testing the bore thickness. It is only to judge whether the block is a candidate for sonic testing.
 +
 
 +
===Tall deck BBC===
 +
The 10.2" deck height tall deck (TD) BBC was made in two different sizes: 366 and 427 cid. These engines were made to stand up to heavy duty use like bus and dump truck, etc. right up to where a diesel would be used. The tall deck height was to facilitate the height of the four ring piston used in the TD BBC engines. The bottom ends were forged and the rods were heavy duty-and heavy in weight.
  
 
These engines can be made into good performing engines without going to too much trouble or expense. '''[http://www.hotrodders.com/forum/cheapo-bbc-505-tall-deck-grunt-motor-164014.html#post1160950 Here]''' is a thread showing a budget build up of a 427 tall deck BBC.
 
These engines can be made into good performing engines without going to too much trouble or expense. '''[http://www.hotrodders.com/forum/cheapo-bbc-505-tall-deck-grunt-motor-164014.html#post1160950 Here]''' is a thread showing a budget build up of a 427 tall deck BBC.
Line 96: Line 124:
 
One of the easiest ways to tell a tall deck BBC block from a standard 9.8" deck height BBC block is to check the distance from the top water pump bolt hole to the block deck. A standard block (below left) will have very little space between the hole and deck; a tall deck block will have around 1/2" between the hole and deck (below right).
 
One of the easiest ways to tell a tall deck BBC block from a standard 9.8" deck height BBC block is to check the distance from the top water pump bolt hole to the block deck. A standard block (below left) will have very little space between the hole and deck; a tall deck block will have around 1/2" between the hole and deck (below right).
  
−
[[File:454 deck.JPG]][[File:Bbc tall deck.jpg]]
+
[[File:454 deck.JPG|355px]][[File:Bbc tall deck.jpg|305px]]
 +
<br style="clear:both"/>
  
 
==BBC 502==
 
==BBC 502==
Line 105: Line 134:
 
==Resources==
 
==Resources==
 
*[[Chevy engine casting numbers]]
 
*[[Chevy engine casting numbers]]
−
 
−
===Mortec===
 
−
<pre>SBC BLOCK CASTING NUMBERS
 
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−
CASTING NUMBER.....SIZE...YEAR...MAIN CAP BOLTS....NOTES
 
−
 
−
140029.....350...80-84...2
 
−
330817.....400...72-80...2
 
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355909.....262.....75....2
 
−
355909.....305...76-79...2
 
−
360851.....262...75-76...2...Monza V8
 
−
361979.....305...77-79...2 or 4, some Canadian assembled heavy duty blocks have 4-bolt main caps
 
−
366245.....350...78-79...4...Bowtie
 
−
366286...................4...Bowtie, siamesed, straight nodular iron main caps,
 
−
2-piece seal, 4.00”-4.150" bores, 2.45" main journals
 
−
366298...................4...Bowtie, Aluminum, billet main caps, 3.398" bore
 
−
with sleeves, two piece rear main seal
 
−
366299...................4...Bowtie, Aluminum, nodular iron splayed caps,
 
−
wet sump, 4.00" bore
 
−
389257.....302.....67....2
 
−
393288.....283...65-67...2
 
−
460703.....350.....78....4
 
−
460776.....305...78-79...2
 
−
460777.....305...78-79...2
 
−
460778.....305...78-79...2 or 4, some Canadian assembled heavy duty
 
−
truck blocks have 4-bolt main caps
 
−
471511.....267...79-82...2
 
−
3556519....283...58-61...2
 
−
3703524....265.....55....2...No oil filter
 
−
3720991....265...56-57...2
 
−
3731548....265...57......2...No side motor mounts
 
−
3731548....283...57......2...No side motor mounts
 
−
3737739....283...58-64...2
 
−
3756519....283...58-62...2
 
−
3782870....327...62-67...2
 
−
3789817....283...62-64...2
 
−
3789817....327...62-67...2
 
−
3789935....283...61-64...2
 
−
3790721....283...62-64...2...Chevy II recessed oil filter boss
 
−
3790721....327...65-66...2...Chevy II recessed oil filter boss
 
−
3791362....327...62-67...2...Chevy II recessed oil filter boss
 
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3792563....327.....65....2
 
−
3792582....283...64-65...2
 
−
3794226....283...58-63...2
 
−
3794460....327...62-64...2
 
−
3830944....327.....63....2
 
−
3834810....283...64-66...2
 
−
3834812....283...62-63...2
 
−
3837739....283...58-62...2
 
−
3849852....283...57-66...2
 
−
3849935....283...65-67...2
 
−
3858174....327...64-67...2
 
−
3858180....327...64-67...2
 
−
3858618....350...68-76...2
 
−
3862194....283...65-67...2...Chevy II recessed oil filter boss
 
−
3862812....283...62-64...2
 
−
3892657....302.....67....2...Z-28 Camaro
 
−
3892657....327.....67....2
 
−
3892657....350.....67....2...Camaro
 
−
3896944....283...66-67...2
 
−
3896948....283...66-67...2
 
−
3903352....327.....67....2
 
−
3914636....307.....68....2
 
−
3914638....307.....68....2
 
−
3914653....307...68-73...2
 
−
3914660....327.....68....2
 
−
3914678....302.....68....2...Z-28 Camaro
 
−
3914678....327.....68....2
 
−
3914678....350.....68....2
 
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3931174....307.....68....2...Truck
 
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3932371....307...69-73...2
 
−
3932373....307...68-73...2
 
−
3932386....302.....69....4...Z-28 Camaro
 
−
3932386....327.....69....2
 
−
3932386....350.....69....2 or 4
 
−
3932388....327.....69....2
 
−
3932388....350.....69....2 or 4
 
−
3933180....327...68-69...2
 
−
3951509....400...70-71...4
 
−
3951509....400...74-80...2
 
−
3951511....400...70-73...4...Some replacement blocks had 2-bolt main caps
 
−
3956618....302.....69....4...Z-28 Camaro
 
−
3956618....327...68-69...2
 
−
3956618....350.....69....2 or 4
 
−
3956632....307.....69....2
 
−
3959512....327...62-67...2...Was also used for some "CE" replacement blocks
 
−
3959532....283...64......2...Used for some "CE" replacement blocks
 
−
3959538....327...........2...Chevy II recessed oil filter boss, used for
 
−
some Chevy II "CE" replacement blocks
 
−
3970010....302.....69....4...Z-28 Camaro
 
−
3970010....327.....69....2...Trucks and industrial
 
−
3970010....350...69-80...2 or 4
 
−
3970014....350...70-76...2 or 4
 
−
3970020....307...69-73...2
 
−
3970024....307...69-73...2
 
−
4715111....305.....80....2
 
−
6259425....350...69-76...2
 
−
10036033...350...........4...Goodwrench crate motor, 2-piece rear seal,
 
−
"Hecho en Mexico"
 
−
10046164...305.....86....2
 
−
10049804.................4...Aluminum, Pontiac Super Duty version of
 
−
Gen. 1 SBC, 4.00" bore, 350 mains, 2-piece rear seal, splayed caps,
 
−
GTP race block
 
−
10051182.................2 or 4...Bowtie, 3.75"-4.30" bores, 1 or 2-piece rear seal
 
−
10051184.................4...Bowtie, 4.00"-4.155" bores, 1 or 2-piece rear seal
 
−
10054727...350...86-up...2 or 4...one piece rear seal, some "Made in Canada"
 
−
10066036...350...........2 or 4...Target Master/Goodwrench crate motor,
 
−
2-piece rear seal, "Hecho en Mexico"
 
−
10066038...350.....92....4...Goodwrench crate motor, 2-piece rear seal,
 
−
"Hecho en Mexico"
 
−
10090511...350.....90....2...LT5, ZR1 Vette, 375hp
 
−
10125327...350...92-up...2 or 4...Gen. 2 LT1, reverse flow cooling
 
−
10125327...350...96-up...2 or 4...Gen. 2 LT4, reverse flow cooling
 
−
10134398.................4...Bowtie, Aluminum, 4.125" bore, 2.65" main journals
 
−
10134996.................4...Bowtie, Aluminum, 4.125" bore, 2.65" main journals
 
−
10153558...350...91-92...4...LT5, ZR1 Vette, 375hp
 
−
10168588...265...94-96...2...L99, Gen. 2, 4.3 Liter V-8, Caprice,
 
−
reverse flow cooling
 
−
10199001...350...93-95...4...LT5, ZR1 Vette, 405hp
 
−
10243878...305...96-98...2...Vortec truck, roller cam, one-piece rear seal
 
−
10243880...350...95-00...2 or 4...Vortec truck, Gen. 1 crate motors and "ZZ4",
 
−
roller cam, one piece rear seal
 
−
12550592...350...97-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12551358.........99-up...Gen. 3, 4.8L or 5.3L, cast iron, truck
 
−
12551364...364...98-04...crossbolted cast iron Gen. 3, 6.0L, truck
 
−
12559378...350...99-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12559846...350...98-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12560621...350...98-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12560626...350...99-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12560629...350...99......crossbolted block, Gen. 3, "LS1", aluminum
 
−
12561168...350...01-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12562174...350...98-up...crossbolted block, Gen. 3, "LS1", aluminum
 
−
12568952...364...05-up...crossbolted block, Gen. 3, 6.0L, aluminum, LS2
 
−
12566910...325...04-up...crossbolted block, Gen. 3, 5.3L, aluminum, SSR truck
 
−
12571048...325...04-up...crossbolted block, Gen. 3, 5.3L
 
−
12573581...364...98-04...crossbolted cast iron, Gen. 3, 6.0L, truck
 
−
12577184...364...98-04...crossbolted cast iron, Gen. 3, 6.0L, truck
 
−
12577396.........02-up...Gen. 3, 4.8L or 5.3L, cast iron, truck
 
−
14010201...305...80-85...2
 
−
14010202...305...80-85...2
 
−
14010203...305...80-85...2
 
−
14010207...350...80-85...2 or 4
 
−
14010209...350...80-85...2 or 4
 
−
14010280...267...79-82...2
 
−
14011064...350...83......4
 
−
14011148...350...87-89.......Roller cam, one-piece rear seal
 
−
14016376...267...79-82...2
 
−
14016379...350...77-79...2 or 4
 
−
14016381...305...80-84...2
 
−
14016382...305...79-84...2
 
−
14016383...305...80-85...2...Truck
 
−
14079287...350...86-90.......Truck
 
−
14088526...350...87-89.......Roller cam, one-piece rear seal
 
−
14088548...350...86-88...2 or 4
 
−
14088551...305...86-87...2...one-piece rear main seal
 
−
14093627...305...87-94...2...Roller or flat tappet cam, one-piece rear seal
 
−
14093638...350...87-95...2 or 4...Roller or flat tappet cam, one-piece rear seal
 
−
14094766...305...86-up...2...One-piece rear seal
 
−
14101147...305...85-up...2
 
−
14101148...350...86-90...4...One-piece rear seal
 
−
14102058...305...87-91...2...Roller cam, one-piece rear seal
 
−
22551656.................4...Chevy/Olds Rocket block, 4.00"-4.190" bores,
 
−
2.45" main journal, splayed caps, dry sump, 2-piece rear seal, 9.025" deck
 
−
22551660.................4...Chevy/Olds Rocket block, 4.00"-4.190" bores,
 
−
400 main journal, splayed steel caps, wet sump, raised cam,
 
−
2-piece rear seal, 9.300" deck
 
−
 
−
 
−
SMALL BLOCK HEAD CASTING NUMBERS:
 
−
 
−
330545.....73......350..........76cc chamber, 2.02”/1.60”
 
−
333881.....74-75...350..........76cc chamber, 2.02”/1.60”
 
−
333882.....74-80...350/400......76cc chamber
 
−
340292.....70's.......Over the counter, angle plug, 64cc chamber
 
−
354434.....75-79...262/267/305...60cc chamber
 
−
358741.....76-79...305
 
−
376445.....77-85...350..........76cc chamber, small valves
 
−
376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber
 
−
462614.....77-79...305..........60cc chamber
 
−
462624.....75-86...350/400......76cc chamber, 1.72”/1.5”, 1.94”/1.5” or
 
−
2.02”/1.6” valves
 
−
458642.....75-84...350..........350
 
−
468642.....76-up...350/400
 
−
471513.....79......267/350
 
−
517513.....79......267/350
 
−
1816887....63......283..........Made in Canada, GMC HD truck
 
−
3636839....55......265
 
−
3703523....55......265
 
−
3713358....55-56...265
 
−
3713569....55-56...265
 
−
3725306....56......265
 
−
3731539....57......283..........283 HP FI
 
−
3731544....57-61...283
 
−
3731554....57-62...283
 
−
3731556....57......283..........Truck, made in Canada
 
−
3731762....56......265..........Vette, 2x4 carbs
 
−
3737775....62-67...283/327
 
−
3740997....57......283..........1x4, 2x4 & FI (exc. 283hp)
 
−
3743056....58......283
 
−
3743096....62-67...327..........GMC Truck
 
−
3747363....57-61...283
 
−
3747460....59-67...283/327......70cc chamber
 
−
3748770....58......283
 
−
3748772....58-61...283
 
−
3755537....57-62...283
 
−
3755539....58-62...283
 
−
3755549....57-62...283
 
−
3755550....59......283
 
−
3755585....62-67...327..........GMC Truck
 
−
3767460....59-60...283
 
−
3767462....62-67...327
 
−
3767465....59-61...283
 
−
3767754....59-61...283..........60cc chamber
 
−
3767792....60-64...283
 
−
3774682....60-64...283/327......70cc chamber
 
−
3774684....62-64...327..........75cc chamber
 
−
3774692....58-64...283..........60cc chamber
 
−
3782461....64-66...327......Camel hump, no accessory holes,
 
−
160cc/62cc port volumes, 62cc chamber
 
−
3782461X...60-63...283/327..Camel hump, no accessory holes,
 
−
larger 172cc/64cc port volumes, 62cc chamber
 
−
3795896....63-65...283......60cc chamber
 
−
3795896....62-64...327......60cc chamber
 
−
3798996....63-67...327
 
−
3814480....60-67...283/327..70cc chamber, 1.72”/1.5” valves
 
−
3814482....62-67...283/327/350..75cc chamber
 
−
3817680....63-67...283/327
 
−
3817681....62-67...327
 
−
3817682....61-62...283
 
−
3836839....55......265
 
−
3836842....57-67...283/327
 
−
3837064....56-62...265/283
 
−
3837065....55-56...265..........Truck
 
−
3848720....57-58...283
 
−
3876775....60-67...283/327......75cc chamber
 
−
3884520....60-67...283..........Some marked "Made in Canada",
 
−
60cc chamber, also used by Studebaker
 
−
3884520....62-67...327..........Some marked "Made in Canada",
 
−
60cc chamber, also used by Studebaker
 
−
3890462....66-67...302/327/350..Camel hump, no accessory holes,
 
−
64cc chamber
 
−
3901068....87-up...350..........Crate motor, 285hp, 64cc chamber
 
−
3911032....68......307/327......70cc chamber
 
−
3912264....58-62...283
 
−
3912265....63-64...283
 
−
3912311....65-67...327
 
−
3912313....65-67...327
 
−
3917290....67-68...307/327
 
−
3917291....67-68...302/327/350..Camel hump, no accessory holes,
 
−
64cc chamber
 
−
3917292....68......327/350......Camel hump, 64cc chamber
 
−
3917293....67-68...307/327......75cc chamber
 
−
3927185....69-76...307/327/350..70cc chamber
 
−
3927186....69-70...302/350......Camel hump, 64cc chamber, accessory holes
 
−
3927187....69-70...350..........Camel hump, 64cc chamber, accessory holes
 
−
3927188....69......327..........74cc chamber
 
−
3927188....70......307..........74cc chamber
 
−
3931633....68-73...307
 
−
3931635....68-76...350
 
−
3931638....68......327..........Truck
 
−
3932441....69-70...350..........76cc chamber
 
−
3932441X...69-70...350/400......80cc chamber
 
−
3932454....69-73...307
 
−
3932454....69-79...350..........Truck
 
−
3946812....69......350
 
−
3946813....69-79...350..........Truck
 
−
3947040....68......327.........."Right angle" casting identifier,
 
−
64cc chamber, good HP head, used in trucks, no accessory holes
 
−
3947041....69-70...302/350......"Right angle" casting identifier,
 
−
64cc chamber, accessory holes, good HP head
 
−
3947041X...69-70...302/350......"Right angle" casting identifier,
 
−
64cc chamber, 165cc intake port, accessory holes, good HP head
 
−
3951598....70......400..........76cc chamber
 
−
3964286............350
 
−
3965742....70......350..........Over the counter, angle plug
 
−
3970126....67-71...327/350
 
−
3973370....69-70...350..........Over the counter in US,
 
−
Canadian 350/300hp production use in Pontiac, 64cc, straight or angle plug
 
−
3973414....70......350..........LT1-350/370hp, camel hump, 64cc chamber
 
−
3973487....71-72...350..........1.94”/1.5” or 2.02”/1.6” valves,
 
−
was also used on '71 350/330hp LT1, 75cc chamber
 
−
3973487X...71-72...350..........1.94”/1.5” or 2.02”/1.6” valves, 75cc chamber
 
−
3973493....71-72...400..........76cc chamber
 
−
3986316....71......350..........76cc chamber
 
−
3986336....71......350..........76cc chamber
 
−
3986336X...71......350..........76cc chamber
 
−
3986339....71......307/350......74cc chamber
 
−
3986339X...71......307/350......74cc chamber
 
−
3986388....68-76...307/350
 
−
3991492....70......350..........LT1, camel hump, accessory holes,
 
−
64cc, straight plug
 
−
3991492....70-up................Over the counter, camel hump, 64cc,
 
−
straight or angle plug
 
−
3998916....72......350..........Also used w/'72 350 LT1, big valves,
 
−
screw in studs, 76cc chamber
 
−
3998920....72-73...350
 
−
3998991....72-73...307/350......75cc chamber
 
−
3998993....72-73...307/350......75cc chamber
 
−
3998993....current..350.........Goodwrench crate motors, "Hecho en Mexico",
 
−
75cc chamber
 
−
3998997....72-73...350/400......76cc chamber
 
−
3998997....78-84...305/350......76cc chamber
 
−
4079261....75......350
 
−
10033867........................Aluminum , over the counter Pontiac 23º
 
−
head, 62cc, angle plug, 196cc intake port
 
−
10045434........................Over the counter Pontiac 15º  head,
 
−
55cc, angle plug, raised runner, aluminum, "roll over" head
 
−
10051101........................Bowtie, aluminum, 55cc, angle plug,
 
−
raised runner, 196cc intake port
 
−
10065202...87-95...350..........Truck
 
−
10065203...87-95...350..........Truck
 
−
10065204...87-95...350
 
−
10065205...87-95...305
 
−
10065206...87-95...350
 
−
10065207...87-95...305
 
−
10088113...88-up...350..........Aluminum, 58cc, angle plug, raised "D"-port
 
−
exhaust, 1.94"/1.5" valves
 
−
10093328........................Over the counter, Pontiac 15º head,
 
−
aluminum, 224cc intake port, 61cc chamber, "roll over" head
 
−
10106178...90......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum
 
−
10106179...90......350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum
 
−
10110810...91-up...350..........Gen. 1, 65cc chamber
 
−
10120928...87-95...350
 
−
10125320...94-96...350..........Gen. 2 LT1, cast iron version,
 
−
used on "9C1" Police package, Impala SS,
 
−
Cadillac Fleetwood, Buick Roadmaster, reverse flow cooling
 
−
10128374...92-up...350..........Gen. 2 LT1, 53cc, angle plug,
 
−
aluminum, reverse flow cooling, 175cc/68cc ports
 
−
10134352........................Bowtie, 45cc, angle plug, "low" port,
 
−
223cc intake port, aluminum, 18º race head
 
−
10134363........................NOTE: This casting # has been used in
 
−
several different versions of aluminum 18º and 15º Bowtie race heads.
 
−
Different chamber volumes, port volumes, port locations, valve sizes,
 
−
etc. were used. Check this casting carefully to determine which features
 
−
it may have. There are at least six different versions as of 11/99.
 
−
10147898...95-98...350..........Gen. 1 crate motor
 
−
10159550...87-95...350
 
−
10159551...87-95...305
 
−
10159552...87-95...350
 
−
10159553...87-95...305
 
−
10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum
 
−
10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum
 
−
10185040........................Bowtie, aluminum, 45cc chambers, 1st. version,
 
−
symmetrical ports, 263cc intake port, splayed valves
 
−
10185040........................Bowtie, aluminum, 45cc chamber, 2nd. version,
 
−
symmetrical ports, 240cc intake port, splayed valves
 
−
10205245...93......350..........Gen. 2 LT1, aluminum, reverse flow cooling,
 
−
175cc/68cc port volumes
 
−
10207643...94-96...350..........Gen. 2 LT1, aluminum, reverse flow cooling,
 
−
175cc/68cc port volumes
 
−
10208890...94-96...265..........Gen. 2, L99, 4.3 Liter V8, cast iron, reverse flow
 
−
10215339...97......350..........Gen. 3, LS1, aluminum, 68cc
 
−
10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve, drvs. side, aluminum
 
−
10225122...95......350..........LT5, ZR1, DOHC, 32-valve, pass. side, aluminum
 
−
10239902...96-up...350..........Gen. 2 LT4, aluminum, reverse flow cooling,
 
−
195cc port, 54.4cc chamber, angle plug
 
−
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
 
−
170cc intake port, 1.94"/1.5" valves
 
−
12367712...99-up................"Fast Burn", aluminum, 210cc intake port,
 
−
2.00”/1.55” valves, 62cc chamber
 
−
12367713...99-up................"Fast Burn" used on ZZ430 crate motor,
 
−
aluminum, 210cc intake port, 2.00”/1.55” valves, 62cc chamber
 
−
12480005...2000.................LS1 "GTZ", aluminum, 38cc chamber,
 
−
2.125"/1.625" valves, angle plug
 
−
12480011...97-up................Bowtie "SB2.2", aluminum, 2nd. version of "SB2",
 
−
48cc chamber, "mirror ports", revised valve angles & plug location
 
−
12506450...87-95...350
 
−
12509859...87-94...305
 
−
12516852...87-95...350
 
−
12529742...95-96...265..........Gen. 2, "L99", cast iron
 
−
12551561...96......350..........Gen. 2, "LT1", aluminum
 
−
12552520...97-up...305..........Vortec, truck
 
−
12554290...94-96...350..........Gen. 2, "LT1", cast iron version,
 
−
used on "9C1" police package, Impala SS,
 
−
Cadillac Fleetwood, Buick Roadmaster, reverse flow cooling
 
−
12554291...95-96...265..........Gen. 2, "L99", cast iron
 
−
12555690...96......350..........Gen. 2, "LT4", aluminum
 
−
12556743...99......325..........Gen. 3, 5.3L, aluminum, truck, van
 
−
12558059...97......305..........Vortec, truck, 1.84"/1.5" valves
 
−
12558062...98......350..........L31 Vortec, truck, 64cc chamber,
 
−
1.94”/1.5”, 170cc intake port
 
−
12558806...97-98...350..........Gen. 3, "LS1", aluminum, 68cc chamber
 
−
12559853...99-up...350..........Gen. 3, "LS1", aluminum, 68cc chamber
 
−
12559862...99-00................Gen. 3, aluminum 4.8/5.3L
 
−
12559895...00-up...325..........Gen. 3, aluminum, Vortec 5.3L
 
−
12561706...01-04................Gen. 3, 5.3L, aluminum
 
−
12561873...99-01...364..........Gen. 3, 71cc, iron
 
−
12562317...01-04...364..........Gen. 3, 71cc, aluminum
 
−
12564241...00-up...350..........Gen. 3, "LS1", aluminum, 68cc chamber
 
−
12564243...01-up...350/364......Gen. 3, "LS6", "LS2", aluminum
 
−
12572035...01-04...364..........Gen. 3, 6.0L, aluminum, 71cc chamber
 
−
14008856...79-81...267
 
−
14010201...82-85...305
 
−
14011034........................Bowtie, cast iron, 64cc chamber,
 
−
184cc intake port volume, angle plug, "Phase 2" head
 
−
14011049........................Bowtie, aluminum, 55cc chamber,
 
−
angle plug, 180cc intake port volume, "Phase 6"
 
−
14011083...55-86...350..........Crate motor for years indicated.
 
−
285/300hp, 64cc chamber, 1.94"/1.5" valves
 
−
14014415...80-85...267/305
 
−
14014416...80-86...305..........1.84"/1.5" valves, 58cc chamber
 
−
14014440...80......305..........1.84"/1.5" valves
 
−
14019821...80-86...350
 
−
14019924...79-81...267
 
−
14019926...80-86...350
 
−
14010516...80-86...350
 
−
14020517...80......350
 
−
14020555...81......305
 
−
14020556...81......350
 
−
14022056...85......350
 
−
14022206...80......350
 
−
14022301...80-86...305
 
−
14022601...80-86...267/305......1.72"/1.5" or 1.84"/1.5" valves, 53cc chamber
 
−
14022801...80-86...305
 
−
14024816...........350..........76cc chamber, 1.94”/1.5” valves,
 
−
Gen. 1 crate motor
 
−
14034806...78-82...267
 
−
14034807...78-86...305
 
−
14034808...80-86...350
 
−
14034808...96-up...350..........76cc chamber, 1.94"/1.5" valves,
 
−
Gen. 1 Goodwrench crate motor
 
−
14034810...80-86...350..........Truck
 
−
14034811...80-86...350..........Truck
 
−
14039121...81-86...305..........Truck
 
−
14039122...81-86...305..........Truck
 
−
14071114...80-86...350
 
−
14075381...80-86...350..........Truck
 
−
14079261...86......350
 
−
14085844...80-86...350..........Truck
 
−
14085963...86......350
 
−
14088526...........350..........Gen. 2, LT1, aluminum
 
−
14089119...86-88...350
 
−
14094093...86-88...350
 
−
14096217...55-86...350..........Crate motor, 285hp/300hp, 64cc chamber,
 
−
72º or 90º center intake manifold bolt angles
 
−
14101081...87-95...305
 
−
14101083...87-up...350..........Gen. 1, also used on crate motors,
 
−
285 or 300 hp, 64cc chamber, 72º center manifold bolt angles
 
−
14101128...86-87...350..........Aluminum, 58cc, angle plug
 
−
14102187...87-91...305..........1.84"/1.5" valves
 
−
14102191...87-up...350
 
−
14102193...87-up...305/350......1.94"/1.5" valves
 
−
22542525........................Dart/Olds/Chevy aluminum,
 
−
14º or 17º race head
 
−
24502559...96-97................Bowtie, "SB2", 1st. version,
 
−
"mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber
 
−
25500141........................Buick/Chevy aluminum, 10º race head,
 
−
42cc chamber, symmetrical ports, 235cc intake port volume, 2.1"/1.625" valves
 
−
25534351C..04-up................Gen. 1 Bowtie, cast iron Vortec head,
 
−
175cc/65cc ports, 2.00”/1.55” valves, "small port” head
 
−
25534371C..04-up................Gen. 1 Bowtie, cast iron Vortec head,
 
−
206cc/77cc ports, 2.00”/1.55” valves, "large port” head
 
−
33417369...90-up...350..........Gen. 1 Goodwrench crate motor,
 
−
"Hecho en Mexico", 76cc chamber
 
−
 
−
 
−
BIG BLOCK CHEVY BLOCK CASTING NUMBERS:
 
−
NOTE: T = tall deck
 
−
Oval includes both "peanut" (also called "round") ports and large oval ports
 
−
 
−
0-326711.....................4-bolt, alum., CanAm, 4.44" bores,
 
−
steel cylinder liners
 
−
340220.....427T......68-85...4-bolt
 
−
345014.....454.......70-86...
 
−
346236.....454.......75-76...2-bolt
 
−
359070.....454.......70-90...
 
−
361959.....454.......73-90...2 or 4 bolt
 
−
364776.....427T......68-85...4-bolt
 
−
364779.....366T......68-90...4-bolt
 
−
399204.....509.......70-71...4-bolt, alum., CanAm, 4.5" bores,
 
−
steel cylinder liners
 
−
399293.....366T......77-78...4-bolt
 
−
473478.....427T......77-90...4-bolt
 
−
495102.......................4-bolt, alum., CanAm, 4.5" bores
 
−
3782870....427T......68-76...4-bolt
 
−
3824553....366T......66-67...4-bolt
 
−
3855961....396.......65-66...2 or 4 bolt
 
−
3855961....427.......66......2-bolt
 
−
3855962....396.......65-66...4-bolt
 
−
3855977....366T......66-73...4-bolt
 
−
3869942....427.......66-67...2 or 4 bolt
 
−
3902406....396.......67......2 or 4 bolt
 
−
3904351....427.......67......2 or 4 bolt
 
−
3904354....366T......66-76...4-bolt
 
−
3916319....366T......68......4-bolt
 
−
3916321....427.......68......2 or 4 bolt
 
−
3916323....396.......68......2 or 4 bolt
 
−
3925521....427T......68-85...4-bolt
 
−
3935439....427.......68-69...2 or 4 bolt
 
−
3935440....396.......68-69...2 or 4 bolt
 
−
3937724....366T......68-85...4-bolt
 
−
3937726....427T......68-84...4-bolt
 
−
3946052....427.......69......4-bolt, alum. ZL-1, Mark IV
 
−
3946053....427.......97-up...4-bolt, alum. ZL1, 2nd. version, Mark IV
 
−
3955270....427.......69......2 or 4 bolt
 
−
3955272....396.......69......2 or 4 bolt
 
−
3955274....366T......68-85...4-bolt
 
−
3955276....427T......68-73...4-bolt
 
−
3963512....427.......69......2 or 4-bolt
 
−
3963512....454.......70-76...2 or 4-bolt
 
−
3969852....366T......68-84...4-bolt
 
−
3969854....396.......69......2 or 4-bolt
 
−
3969854....402.......70-72...2 or 4-bolt
 
−
3969858....427T......68-84...4-bolt
 
−
3999289....454.......71-79...2 or 4-bolt, some "CE" replacement blocks
 
−
had four bolt main caps
 
−
3999290....396.......68-69...2 or 4-bolt, truck
 
−
3999290....402.......70-72...2 or 4-bolt, truck
 
−
3999290....402.......72......2 or 4 bolt, passenger car
 
−
3999293....366T......68-90...4-bolt
 
−
3999294....427T......68-84...4-bolt
 
−
10051107...454...............4-bolt, Bowtie, Mark IV, 9.8" deck,
 
−
siamesed bores, 4.25" semi-finished bores, can be bored to 4.50"
 
−
10069282...366T......90-91...4-bolt, Mark IV, tall deck
 
−
10069284...427T..............4-bolt, Mark IV, tall deck
 
−
10069286...454.......90-91...4-bolt, Mark IV, short deck
 
−
10114182...454.......91-up...4-bolt, Gen. 5
 
−
10114183...366T......91-up...4-bolt, Gen. 5
 
−
10114184...427T......91-up...4-bolt, Gen.5
 
−
10134366...454T..............4-bolt, Bowtie, Gen. 5, tall deck
 
−
10185050...454...............4-bolt, Bowtie, Gen. 5, short deck
 
−
10237297...454.......96-up...4-bolt, Vortec 7400", "L-29" Gen. 6
 
−
10237299...427T......96-up...4-bolt, Gen. 6, 7.0L, truck
 
−
10237300...502.......96-up...4-bolt, Gen. 6, 4.466" bore
 
−
12550312...427T......96-up...4-bolt, Gen. 6, 4.250" bore, fuel pump boss,
 
−
clutch linkage pivot boss
 
−
12550313...454.......91-up...4-bolt, Gen. 5 crate motor, Gen. VI 4.25"
 
−
bare block, fuel pump boss
 
−
12556110...496.......01-up...4-bolt, Gen. 7, 8.1L, "Vortec 8100", truck
 
−
12561357...454.......96-up...4-bolt, Gen. 6
 
−
12561358...502...............4-bolt, Gen. 6
 
−
14015443...454.......87-90...2 or 4-bolt, Mark IV, truck, motorhome
 
−
14015445...454.......78-90...2 or 4-bolt
 
−
14044807...454T..............4-bolt, Bowtie, Mark IV, CNC prep, tall deck,
 
−
4.25" or 4.495" bores
 
−
14096859...502...............4-bolt, Gen. 5, HO
 
−
24502504...454...............4-bolt, Bowtie, Gen. 5, race prep,
 
−
9.8” "short" deck height
 
−
24502506...454T..............4-bolt, Bowtie, Gen. 5, race prep,
 
−
10.2” "tall" deck height
 
−
24502572.....................4-bolt, 4.5" bore Olds DRCE 2, 9.5" deck height
 
−
25534402.....................4-bolt, 4.590" bore Olds DRCE 3, 9.25" deck height
 
−
 
−
 
−
BIG BLOCK CHEVY HEAD CASTING NUMBERS:
 
−
 
−
330864.....68-84...oval...OPEN...396, 402, 366T, 427T, 454 Truck
 
−
330865.....68-84...oval...OPEN...396, 402, 366T, 427T, 454 Truck
 
−
330866.....68-78...oval...OPEN...366T, 427T
 
−
330867.....68-73...oval...OPEN...427T
 
−
336765.....68-78...oval...OPEN...427T
 
−
336768.....73-76...oval...OPEN...427T
 
−
336781.....73-85...oval...OPEN...454, 118cc chamber, 256cc/114cc ports
 
−
343771.....68-86...oval...OPEN...366T, 427T, 454
 
−
343772.....68-86...oval...OPEN...366T, 427T, 454
 
−
343783.....70-76...oval...OPEN...454 truck
 
−
346236.....75-87...oval...OPEN...454, 120cc chamber, 225cc/116cc ports
 
−
352625.....70-76...oval...OPEN...454 truck
 
−
353049.....73-84...oval...OPEN...454, 122cc chamber, 255cc/119cc ports
 
−
366765.....74-78...oval...OPEN...427T
 
−
473328.....68-69...oval...OPEN...366T
 
−
3856206....65-66...oval..CLOSED..396, 97cc chamber
 
−
3856208....65......rect..CLOSED..396/425hp, 109cc chamber
 
−
396/375hp "Z-16" Chevelle
 
−
3856213....66-82...oval..CLOSED..366T, 427T
 
−
3856260....68......oval..CLOSED..396 truck
 
−
3872702....65-66...oval..CLOSED..396, 427, 98cc chamber
 
−
3873858....65-67...rect..CLOSED..396, 427, 109cc chamber
 
−
3876875....77-85...oval...OPEN...427T
 
−
3904390....67......oval..CLOSED..396, 427, 98cc chamber
 
−
3904391....67......rect..CLOSED..396, 427, 107cc chamber
 
−
3904392....67......rect..CLOSED..427, aluminum, L88, L89, 107cc chamber
 
−
3904393....68-76...oval...OPEN...366T
 
−
3908952....67......oval...OPEN...427, truck, marine
 
−
3909802....67......oval..CLOSED..396, 427, 101cc chamber
 
−
3917215....67-68...oval..CLOSED..396, 427, 101cc chamber
 
−
3917219....68-85...oval...OPEN...366T, 427T
 
−
3919840....67-69...rect..CLOSED..396, 427, 107cc chamber
 
−
3919842....68-69...rect..CLOSED..396, 427, aluminum L88, L89, 107cc chamber
 
−
3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber
 
−
3933148....69-84...oval...OPEN...'69 396/265hp, 366T, 427T, 112cc chamber
 
−
3933149....68-76...oval...OPEN...427T, 122cc chamber
 
−
3935401....68-76...oval...OPEN...427T
 
−
3946074....69&71...rect...OPEN...'69 427 L88, ZL1, aluminum, 118cc chamber,
 
−
'71 454 LS6, "round exhaust port"
 
−
3964290....69-70...oval..CLOSED..396, 402, 427, 454, 101cc chamber,
 
−
large or small hex spark plugs used
 
−
3964291....69-72...rect..CLOSED..396, 402, 427, 454, 109cc chamber,
 
−
large or small hex spark plugs used, crate motor usage in years after 1970
 
−
3965198....68-69...oval..CLOSED..396 truck
 
−
3975950....68-70...oval...OPEN...396, 402 Truck, 366T, 427T
 
−
3986133....68-85...oval...OPEN...366T, 427T, 454 truck
 
−
3986135....69-73...oval...OPEN...366T, 427T
 
−
3986136....68-84...oval...OPEN...366T, 427T, 454 truck
 
−
3993820....71......oval...OPEN...402, 113cc chamber, 255cc/114cc ports
 
−
3993820....71-84...oval...OPEN...454 passenger and trucks, 113cc chamber,
 
−
255cc/114cc ports
 
−
3994026....71......rect...OPEN...454 LS6, 118cc chamber
 
−
3999241....72......oval...OPEN...402, 454, 113cc chamber
 
−
6272292....70-78...oval...OPEN...402, 454
 
−
6272990....70-up...rect...OPEN...454 service replacement, used on some
 
−
Mark IV crate engines, 118cc chamber
 
−
10045427...........rect..........Pontiac/Chevy, aluminum, 91cc chamber,
 
−
large port, race
 
−
10049875...........rect..........Pontiac/Chevy, aluminum
 
−
Small port, race
 
−
10051128...........rect..........Bowtie, aluminum, 72cc chamber,
 
−
symmetrical ports
 
−
10051129...........rect..........Bowtie, aluminum "raw" casting,
 
−
symmetrical ports
 
−
10052902...........oval...OPEN...Mark IV, 427T
 
−
10101140...91-up...oval..CLOSED..Gen. 5 366T, 427T
 
−
10114156...91-up...oval...OPEN...Gen. 5 & 6 454, 118cc chamber
 
−
10141279...96-up...oval..CLOSED.."Vortec 7400", 100cc chambers
 
−
10487052...77-90...oval...OPEN...366T
 
−
12363391...96-up...oval...OPEN...Bowtie, aluminum, Signature Series,
 
−
fits Mark IV, Gen. 5, Gen. 6, 110cc chamber
 
−
12363401...96-up...rect...OPEN...Bowtie, aluminum, Signature Series,
 
−
fits Mark IV, Gen. 5, Gen. 6, 118cc chamber
 
−
12558162...01-up...oval..CLOSED..Gen. 7, "Vortec 8100", 8.1L, 496, truck
 
−
12560241...98-up...oval..CLOSED.."Vortec 7400", 100cc chamber
 
−
12562932...91-95...oval...OPEN...Gen. 5, truck crate motor, 118cc chamber
 
−
12562933...91-95...oval...OPEN...Gen. 5, 118cc chamber
 
−
12562934...00-up...rect...OPEN...Gen. 6, 502 marine
 
−
14011077...69-up...rect...OPEN...aluminum, fits Mark IV, "C-port",
 
−
118cc chamber, also sold as a "solid" head
 
−
14044861...84-96...rect..........Bowtie, aluminum, Mark IV, "raised runner",
 
−
1st. design, 105cc chamber
 
−
14044861...96-up...rect..........Bowtie, Aluminum, Signature Series,
 
−
fits Mark IV, Gen. 5, Gen. 6, "raised runner", 2nd. design, 115cc chamber
 
−
14044861...84-96...rect..........Bowtie, aluminum, Mark IV, "raw" casting
 
−
of "861" Mark IV 1st. design
 
−
14081045...78-87...oval...OPEN...454
 
−
14081052...85-87...oval...OPEN...366T, 427T, 454 Truck, marked "HiPerf"
 
−
14092359...86-90...oval...OPEN...366T, 427T, marked "HiPerf"
 
−
14092360...86-90...oval...OPEN...454 truck, "peanut" round ports
 
−
14096188...70-71...rect...OPEN...454 service replacement, also used on
 
−
later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber
 
−
14097088...91-up...rect...OPEN...Gen. 5, 454/502 HO, 118cc chamber
 
−
24502585...97......rect..........Olds/Chevy, DRCE 2, Pro Stock aluminum,
 
−
for blocks w/4.900" bore spacing
 
−
25534404...04......rect..........Olds/Chevy, DRCE 3, Pro Stock, aluminum,
 
−
for blocks with 4.900" bore spacing
 
−
 
−
 
−
CHEVY SMALL BLOCK CRANKSHAFT CASTING NUMBERS:
 
−
 
−
WITH 2-PIECE REAR MAIN OIL SEAL
 
−
 
−
1130.......327.......forged..medium journal...3.25" stroke
 
−
1178.......302.......forged..medium journal...3.00" stroke
 
−
1181.......305,350...cast....medium journal...3.48" stroke
 
−
1182.......350.......forged..medium journal...3.48" stroke
 
−
2680.......327.......forged..small journal....3.25" stroke
 
−
2690.......350.......forged..medium journal...3.48" stroke
 
−
3279.......302.......forged..medium journal...3.00" stroke
 
−
3474.......283.......forged..small journal....3.00" stroke, military tank use
 
−
4577.......327.......forged..small journal....3.25" stroke
 
−
4672.......327.......forged..medium journal...3.25" stroke
 
−
310514.....350.......cast....medium journal...3.48" stroke
 
−
330550.....350.......cast....medium journal...3.48" stroke
 
−
354431.....262.......cast....medium journal...3.10" stroke
 
−
3727449....283.......forged..small journal....3.00" stroke
 
−
3729449....265.......forged..small journal....3.00" stroke
 
−
3734627....327.......forged..small journal....3.25" stroke
 
−
3735236....265,283...forged..small journal....3.00" stroke
 
−
3735263....283.......forged..small journal....3.00" stroke
 
−
3782680....327.......forged..small journal....3.25" stroke
 
−
3814671....327.......forged..small journal....3.25" stroke
 
−
3815822..265,283,302.forged..small journal....3.00" stroke
 
−
3835236....283.......forged..small journal....3.00" stroke
 
−
3836266....283.......forged..small journal....3.00" stroke
 
−
3848847....283.forged or cast..sm. journal....3.00" stroke
 
−
3849847....283.......forged..small journal....3.00" stroke
 
−
3876764....283.forged or cast..sm. journal....3.00" stroke
 
−
3876768....283.......forged..small journal....3.00" stroke
 
−
3884577....327.......forged..small journal....3.25" stroke
 
−
3892690....350.......forged..medium journal...3.48" stroke
 
−
3911001....307,327...cast....medium journal...3.25" stroke
 
−
3911011....307,327...cast....medium journal...3.25" stroke
 
−
3914672....327.......forged..medium journal...3.25" stroke
 
−
3923279....302.......forged..medium journal...3.00" stroke
 
−
3932442..267,305,350..cast...medium journal...3.48" stroke
 
−
3941174....307,327...cast....medium journal...3.25" stroke
 
−
3941178....302.......forged..medium journal...3.00" stroke
 
−
3941182....350.......forged..medium journal...3.48" stroke
 
−
3941188....350.......forged..medium journal...3.48" stroke
 
−
3949847....283..forged or cast..small journal...3.00" stroke
 
−
3951130....327.......forged..medium journal...3.25" stroke
 
−
3951529....400.......cast....large journal....3.75" stroke
 
−
 
−
WITH 1-PIECE REAR MAIN OIL SEAL
 
−
 
−
10168568...265.......cast....medium journal...3.00" stroke
 
−
12552215...364.......cast....medium journal...3.62" stroke, Gen. 3, 6.0L
 
−
12552216...325,350,364.......cast....medium journal...3.62" stroke,
 
−
Gen. 3 5.7L LS1, 5.3L, 6.0L
 
−
12553312...293.......cast....medium journal, 3.27" stroke, Gen. 3, 4.8L
 
−
12553482...293.......cast....medium journal, 3.27" stroke, Gen. 3, 4.8L
 
−
14088526...305,350...cast....medium journal...3.48" stroke
 
−
14088532...350.......forged..medium journal...3.48" stroke
 
−
14088535...305,350...cast....medium journal...3.48" stroke
 
−
14088552...350.......forged..medium journal...3.48" stroke
 
−
 
−
 
−
ZR1, "LT5", 350 DOHC
 
−
 
−
10106122...350.......forged..large 2.76" journal...3.66" stroke
 
−
 
−
 
−
CHEVY BIG BLOCK CRANKSHAFT CASTING NUMBERS:
 
−
 
−
3.76" STROKE WITH 2-PIECE REAR MAIN OIL SEAL
 
−
Used on '65-'90 Mark IV 366T, 396, 402, 427 and 427T
 
−
 
−
6223.......396,402,427...forged, 1053 steel
 
−
7115.......396,402,427...forged, nitrided, cross-drilled, 5140 steel
 
−
3804816....396,402,427...cast
 
−
3856223....396...forged
 
−
3863114....402...
 
−
3863144....396,402...
 
−
3874874....396,402...
 
−
3879621....427...forged
 
−
3882841....396...forged, cross drilled, nitrided
 
−
3882842....427...forged, cross drilled, nitrided
 
−
3882847....
 
−
3882848....
 
−
3882849....427...forged
 
−
3887114....396...forged, nitrided, 5140 steel
 
−
3904815....396,402...cast, nodular iron
 
−
3941180....
 
−
3942411....
 
−
3965746..........semi- finished, forged
 
−
3993804..........raw, 5140 steel
 
−
 
−
3.76" STROKE WITH 1-PIECE REAR MAIN OIL SEAL
 
−
Used on '91-up Gen. 5 and Gen. 6, 366T, 427T
 
−
 
−
10114186...427T...forged, 1053 steel
 
−
10114187...366T...cast
 
−
10114189...427T...cast
 
−
 
−
 
−
4.00" STROKE WITH 2-PIECE REAR MAIN OIL SEAL
 
−
Used on '70-90 Mark IV 454 or Mark IV 502
 
−
 
−
3520.......454...forged, cross-drilled, 1053 steel
 
−
3521.......454, 502...forged, cross-drilled, 5140 steel
 
−
3524.......454...forged
 
−
7416.......454, 502...forged, cross-drilled, 1053 steel
 
−
7463.......454...forged
 
−
336782.....454...cast
 
−
353039.....454...cast
 
−
353638.....454...
 
−
359730.....454...
 
−
3962523....454...forged
 
−
3963523....454...
 
−
3963524....454...forged
 
−
3967416....454...forged
 
−
3967463....454...forged
 
−
3975945....454
 
−
3963521....454...forged, cross drilled, 5140 steel
 
−
3965753..........semi-finished, forged, 5140 steel
 
−
3975495....454
 
−
3993878....454...forged
 
−
10051169...454...forged raw casting
 
−
 
−
4.00" STROKE WITH 1-PIECE REAR MAIN OIL SEAL
 
−
Used on '91-up Gen. 5 and Gen. 6 454 or 502
 
−
 
−
10114188...454......cast
 
−
14097044...454, 502..forged, 1053 steel
 
−
 
−
 
−
348/409/427 W-ENGINE BLOCK CASTING NUMBERS:
 
−
 
−
3732755.....348......59-61
 
−
3732811.....348......58
 
−
3751872.....348......58
 
−
3755011.....348......59-61
 
−
3771705.....348......59-61
 
−
3782012.....348......58-61
 
−
3788068.....409......62-63
 
−
3795623.....409......61
 
−
3798962.....348......62-65...truck
 
−
3815707.....348......58-61
 
−
3830814.....427......63......"Z11" (4.312" bore x 3.65" stroke)
 
−
3830814.....409......63-64
 
−
3839752.....409......62-63
 
−
3839754.....409......65
 
−
3844422.....409......63-65
 
−
3857655.....348......62-65...truck
 
−
3857656.....409......64-65
 
−
3860386.....409......62-64
 
−
3860387.....348......58
 
−
 
−
 
−
348/409/427 W-ENGINE HEAD CASTING NUMBERS:
 
−
 
−
3732791.....348......58-60
 
−
3758379.....348......59-61...250 hp
 
−
3759256.....348......58
 
−
3759332.....348......58-60
 
−
3764702.....348......60......truck
 
−
3767738.....348......59-60...250 hp
 
−
3781147.....348......60-61...HiPerf, 2.06"/1.72" valves
 
−
3781173.....348......60......1.94"/1.66" valves
 
−
3795586.....348/409..61......HiPerf, 2.06"/1.72" valves
 
−
3814690.....409......62-63...HiPerf, 2.19"/1.72" valves
 
−
3815643.....348/409..58-62...truck, industrial
 
−
3815857.....348/409..58-62...truck
 
−
3819333.....348/409..62-65...HD Truck
 
−
3830817.....409......63-65...340 hp
 
−
3837731.....427......63......"Z11" (4.312" bore x 3.65" stroke)
 
−
3852583.....409......63-65...HiPerf, 2.19"/1.72" valves
 
−
 
−
CHEVY 348/409/427 W-ENGINE CRANKSHAFT CASTING NUMBERS:
 
−
 
−
3732692...348...forged...3.25" stroke
 
−
3733223...348...forged...3.25" stroke
 
−
3733226...348...forged...3.25" stroke
 
−
3741640...348...forged...3.25" stroke
 
−
3741642...348...forged...3.25" stroke
 
−
3788072...409...forged...3.50" stroke
 
−
3795589...409...forged...3.50" stroke
 
−
3824553...348...forged...3.25" stroke
 
−
3829027...409...forged...3.50" stroke
 
−
3837466...409,427 "Z11"...forged...3.65" stroke
 
−
3838416...409...forged...3.50" stroke
 
−
 
−
 
−
CHEVY SMALL BLOCK BORE AND STROKE
 
−
 
−
262 = 3.671" x 3.10" (Gen. 1, 5.7" rod)
 
−
265 = 3.750" x 3.00" ('55-'57 Gen. 1, 5.7" rod)
 
−
265 = 3.750" x 3.00" ('94-'96 Gen. 2, 4.3 liter V8 "L99", 5.94" rod)
 
−
267 = 3.500" x 3.48" (Gen. 1, 5.7" rod)
 
−
283 = 3.875" x 3.00" (Gen. 1, 5.7" rod)
 
−
293 = 3.779" x 3.27" ('99-later, Gen. 3, "LR4" 4.8L Vortec, 6.278" rod)
 
−
302 = 4.000" x 3.00" (Gen. 1, 5.7" rod)
 
−
305 = 3.736" x 3.48" (Gen. 1, 5.7" rod)
 
−
307 = 3.875" x 3.25" (Gen. 1, 5.7" rod)
 
−
325 = 3.779" x 3.622" ('99-later, Gen. 3, "LM7", "LS4 front wheel drive V8"
 
−
5.3L Vortec, 6.098" rod)
 
−
327 = 4.000" x 3.25" (Gen. 1, 5.7" rod)
 
−
345 = 3.893" x 3.622" ('97-later, Gen. 3, "LS1", 6.098" rod)
 
−
350 = 4.000" x 3.48" (Gen. 1, 5.7" rod)
 
−
350 = 4.000" x 3.48" ('96-'01, Gen. 1, Vortec, 5.7" rod)
 
−
350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC,
 
−
5.74" rod)
 
−
364 = 4.000" x 3.622" ('99-later, Gen. 3, "LS2", "LQ4" 6.0L Vortec, 6.098" rod)
 
−
376 = 4.065" x 3.622" (2007-later, Gen. 4, "L92", Cadillac Escalade, GMC Yukon)
 
−
383 = 4.000" x 3.80" ('00, "HT 383", Gen. 1 truck crate motor, 5.7" rod)
 
−
400 = 4.125" x 3.75" (Gen. 1, 5.565" rod)
 
−
427 = 4.125" x 4.00" (2006 Gen. 4, LS7 SBC, titanium rods)
 
−
 
−
Two common, non-factory small block combinations:
 
−
377 = 4.155" x 3.48" (5.7" or 6.00" rod) 400 block and a 350 crank with
 
−
"spacer" main bearings
 
−
383 = 4.030" x 3.75" (5.565" or 5.7" or 6.0" rod) 350 block and a 400 crank,
 
−
main bearing crank journals cut to 350 size
 
−
 
−
 
−
CHEVY BIG BLOCK V8 BORE AND STROKE
 
−
 
−
366T (tall deck) = 3.935" x 3.76"
 
−
396 = 4.096" x 3.76"
 
−
402 = 4.125" x 3.76"
 
−
427 = 4.250" x 3.76"
 
−
427T (tall deck) = 4.250" x 3.76"
 
−
454 = 4.250" x 4.00"
 
−
496 = 4.250" x 4.37" (2001 Vortec 8100, 8.1 liter)
 
−
502 = 4.466" x 4.00"
 
−
572T (tall deck) = 4.560" x 4.375" (2003 "ZZ 572" crate motor)
 
−
 
−
ALL production big blocks used a 6.135" length rod.
 
−
 
−
 
−
CHEVY 348-409 V8 BORE AND STROKE
 
−
 
−
348 = 4.125" x 3.25" (6.125" rod)
 
−
409 = 4.312" x 3.50" (6.010" rod)
 
−
427 = 4.312" x 3.65" (6.135" rod), 1963 "Z11" SHP drag race
 
−
 
−
 
−
CHEVY SMALL BLOCK CRANKSHAFT JOURNAL SIZES
 
−
 
−
Gen. 1, "Small Journal"
 
−
265...Mains- 2.30", Rods- 2.00"
 
−
283...Mains- 2.30", Rods- 2.00"
 
−
302...Mains- 2.30", Rods- 2.00"
 
−
327...Mains- 2.30",  Rods- 2.00"
 
−
 
−
 
−
Gen. 1, "Medium Journal", includes Vortec 305 and 350 through '98
 
−
262...Mains- 2.45", Rods- 2.10"
 
−
267...Mains- 2.45", Rods- 2.10"
 
−
302...Mains- 2.45", Rods- 2.10"
 
−
305...Mains- 2.45", Rods- 2.10"
 
−
307...Mains- 2.45", Rods- 2.10"
 
−
327...Mains- 2.45", Rods- 2.10"
 
−
350...Mains- 2.45", Rods- 2.10"
 
−
 
−
 
−
Gen. 1, "Large Journal"
 
−
400...Mains- 2.65", Rods- 2.10"
 
−
 
−
 
−
Non-production Gen. 1 combination using Gen. 1 400 crank in Gen. 1 350 block
 
−
383...400 crank, Mains cut to 2.45", Rods- 2.10"
 
−
 
−
 
−
Non-production Gen. 1 combination, using Gen. 1 350 crank in Gen. 1 400 block
 
−
377..."Spacer" or "thick" main bearings with 350 crank, Rods- 2.10"
 
−
 
−
 
−
Gen. 2, "Medium Journal", includes "L-99" 265, "LT1" 350, "LT4" 350
 
−
265...Mains- 2.45", rods-2.10"
 
−
305...Mains- 2.45", Rods-2.10"
 
−
350...Mains-2.45", Rods-2.10"
 
−
 
−
 
−
Non-production Gen. 2 combination, using Gen. 2 265 "L-99" crank in Gen. 2 350 block
 
−
302...Mains- 2.45", Rods- 2.10"
 
−
 
−
 
−
Gen. 3, includes '97-2005 "LS1" Corvette, Firebird, Camaro
 
−
345...Mains- 2.558", Rods- 2.10"
 
−
 
−
 
−
Corvette "ZR1", DOHC, "LT5"
 
−
350...Mains- 2.76", Rods- 2.10"
 
−
 
−
 
−
CHEVY BIG BLOCK CRANKSHAFT JOURNAL SIZES
 
−
 
−
366T
 
−
396
 
−
402
 
−
427
 
−
427T
 
−
454
 
−
502
 
−
ALL Chevy big blocks used Mains- 2.7488"-2.7495", Rods- 2.20"
 
−
 
−
 
−
CHEVY W-ENGINE CRANKSHAFT JOURNAL SIZES
 
−
 
−
348
 
−
409
 
−
427 Z-11
 
−
All W-motors used Mains- 2.50", Rods- 2.20"
 
−
</pre>
 
−
 
−
 
−
[[Category:Identification and decoding]]
 
−
[[Category:Engine]]
 
−
[[Category:GM]]
 

Latest revision as of 22:22, 16 September 2013

Retrieved from "https://www.crankshaftcoalition.com/wiki/index.php?title=Identifying_Chevy_engines&oldid=36057"
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