Editing 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]] | ||
− | One of the easiest way to identify a Chevrolet engine is by the casting number (c/n) that is | + | 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. |
− | + | 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. | |
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===SBC engine casting numbers=== | ===SBC engine casting numbers=== | ||
− | + | {{Note1}} 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''']. | |
− | + | *[http://www.nastyz28.com/sbchevy/sblock.html smallblock info] from nastyz28.com | |
− | *[http://www.nastyz28.com/sbchevy/sblock.html | + | |
*[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. | + | *[http://www.classictruckshop.com/castgm_smblock.asp SBC casting numbers] from classictruckshop.com |
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*[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=== | ||
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*[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 | ||
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==Suffix codes== | ==Suffix codes== | ||
− | 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 | + | 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> |
− | + | {{Note1}} Chevymania.com is not currently responding as of 09/2012 | |
− | + | *[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] from nastyz28.com | |
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− | *[http://chevymania.com/partsid/suffix.cfm?block=Small SBC suffix code list] | + | |
− | *[http://chevymania.com/partsid/suffix.cfm?block=Big BBC suffix code list] | + | |
− | *[http://www.nastyz28.com/chevy-engine-code-stampings.php Suffix and VIN codes] | + | |
==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. | |
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==SBC Head casting numbers== | ==SBC Head casting numbers== | ||
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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=== | |
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− | ==BBC | + | |
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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"/> | ||
− | + | ==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"/> | ||
− | + | ==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"/> | ||
− | + | ==Tall deck BBC== | |
− | + | 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. | |
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− | The 10.2" deck height tall deck | + | |
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. | ||
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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:454 deck.JPG]][[File:Bbc tall deck.jpg]] |
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==BBC 502== | ==BBC 502== | ||
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A 454 bore diameter will be about 4.25". A 502 will be about 4.5". | A 454 bore diameter will be about 4.25". A 502 will be about 4.5". | ||
− | + | [[Category:Identification and decoding]] | |
− | + | [[Category:Engine]] | |
+ | [[Category:GM]] |