Editing SBC cylinder head identification
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==Overview== | ==Overview== | ||
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The most recognized end casting identifier of the SBC heads is the "fuelie", "double hump", or "camel hump". It got the name fuelie from the fact that it was used on optional high performance fuel injected SBC engines, mainly installed in the Corvette. The name fuelie is somewhat of a misnomer, however; the fuelie heads were used on carbureted engines as well. | The most recognized end casting identifier of the SBC heads is the "fuelie", "double hump", or "camel hump". It got the name fuelie from the fact that it was used on optional high performance fuel injected SBC engines, mainly installed in the Corvette. The name fuelie is somewhat of a misnomer, however; the fuelie heads were used on carbureted engines as well. | ||
− | The names | + | The names "double hump" and "camel hump" comes from the physical shape of the casting identifier. The fuelie head was used from the 1960's to the 1970's on the high performance optional engines up to and including the 375 HP fuel injected L-84 327 cid engine, and the 365 HP L-79 4-barrel engine of 1964, and the bad-to-the-bone LT-1 engine, to name just three. |
===Casting number "462" fuelie heads=== | ===Casting number "462" fuelie heads=== | ||
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*'''G-''' Left-facing right triangle c/n 041, 1969-'70 350/300HP, accessory bolt holes, most have 1.94" x 1.50" valves | *'''G-''' Left-facing right triangle c/n 041, 1969-'70 350/300HP, accessory bolt holes, most have 1.94" x 1.50" valves | ||
− | *'''H-''' Small “camel hump” c/n 186, 492. Later high performance or “fuelie” heads, some c/n 186 (1969 and later) and all c/n 492 have accessory bolt holes. Either 1.94" x 1.50" or 2.02" x 1.60" valves, 64cc nominal chamber volume. 1970 LT-1/Z-28 use c/n | + | *'''H-''' Small “camel hump” c/n 186, 492. Later high performance or “fuelie” heads, some c/n 186 (1969 and later) and all c/n 492 have accessory bolt holes. Either 1.94" x 1.50" or 2.02" x 1.60" valves, 64cc nominal chamber volume. 1970 LT-1/Z-28 use c/n 492. |
*'''I-''' Large triangle over rectangle (“crown”) c/n 882. Large chamber (76 cc nominal), hardened exhaust valve seats, compromised intake port (1971-'76 350/400 cid). One of the most common smog heads, performance use is limited. | *'''I-''' Large triangle over rectangle (“crown”) c/n 882. Large chamber (76 cc nominal), hardened exhaust valve seats, compromised intake port (1971-'76 350/400 cid). One of the most common smog heads, performance use is limited. | ||
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*'''P-''' Double (Captain’s) bars c/n 193. Used on TBI equipped engines. Mid 1980-up style centerbolt valve cover. Has restrictive vane cast in intake port to induce swirl/turbulence. Not usually recommended for high RPM performance applications unless serious port work is done. Hardened exhaust seats. | *'''P-''' Double (Captain’s) bars c/n 193. Used on TBI equipped engines. Mid 1980-up style centerbolt valve cover. Has restrictive vane cast in intake port to induce swirl/turbulence. Not usually recommended for high RPM performance applications unless serious port work is done. Hardened exhaust seats. | ||
− | {{Note1}} Return to [[SBC cylinder head identification#Cast in identifiers|'''Cast in identifiers''']] | + | {{Note1}} Return to [[SBC cylinder head identification#Cast in identifiers|'''Cast in identifiers''']] |
==SBC heads to avoid== | ==SBC heads to avoid== | ||
*The c/n 462624 is said to be very prone to cracking. Even though they can be found fitted with 2.02" x 1.60" valves and screw in studs/guideplates from the factory, they still are not a good choice for serious performance use. | *The c/n 462624 is said to be very prone to cracking. Even though they can be found fitted with 2.02" x 1.60" valves and screw in studs/guideplates from the factory, they still are not a good choice for serious performance use. | ||
− | *1971-up heads with casting numbers 882, 993, 487, 336 (and others) can have 3/8" exhaust stems as well as 1.72" intake valves. Heavy 20-30 Series truck uses these, mainly. Both small 1.72" intake and 3/8" stem exhaust valves may be found on c/n 261, 624. Also 1987-'95 center bolt valve cover-type head c/n 14102191 | + | *1971-up heads with casting numbers 882, 993, 487, 336 (and others) can have 3/8" exhaust stems as well as 1.72" intake valves. Heavy 20-30 Series truck uses these, mainly. Both small 1.72" intake and 3/8" stem exhaust valves may be found on c/n 261, 624. Also 1987-'95 center bolt valve cover-type head c/n 14102191 can also have the 3/8" exhaust valve stem. |
− | *Usually swirl port TBI SBC heads are not used in high performance applications because | + | *Usually swirl port TBI SBC heads are not used in high performance applications because they run out of breath earlier than the RPM most performance camshafts need to make peak power. Some casting numbers for them are 187, 191, 193. Similar to the [http://www.crankshaftcoalition.com/wiki/Swirl_port_SBC_heads swirl port heads], but without the swirl-inducing vane are c/n 14011083 and 14096217. |
==Current head casting/part numbers, specs== | ==Current head casting/part numbers, specs== | ||
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==Resources== | ==Resources== | ||
;SBC casting numbers | ;SBC casting numbers | ||
− | *[http://www. | + | *[http://www.crankshaftcoalition.com/wiki/Identifying_Chevy_engines#Mortec_info Mortec casting number info] |
*[http://outintheshop.com/faq/casting/castings2.html SBC head casting number "go-to" site] from outintheshop.com | *[http://outintheshop.com/faq/casting/castings2.html SBC head casting number "go-to" site] from outintheshop.com | ||
*[http://chevytech.info/3c10o12.html Head info by c/n], some with photos from chevytech | *[http://chevytech.info/3c10o12.html Head info by c/n], some with photos from chevytech |