SBC cylinder head identification
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'''462''' is the most-used SBC head casting number out there- at least six different SBC cylinder head casting numbers end in 462, according to 'the books': | '''462''' is the most-used SBC head casting number out there- at least six different SBC cylinder head casting numbers end in 462, according to 'the books': | ||
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• 3990462 | • 3990462 | ||
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<br style="clear:both"/> | <br style="clear:both"/> | ||
| − | === | + | ===Fuelie casting identifiers=== |
| − | [[File:Fuelie end ids1.jpg]] | + | [[File:462 double hump head.gif|left|frame|thumb|SBC cylinder head casting number 3990462, c/n 378461 similar.]][[File:Fuelie end ids1.jpg]] <br style="clear:both"/> |
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| − | ==Vortec L30 5.0L | + | ==Vortec L30 5.0L 305 head casting number 12558059== |
| + | {| | ||
| + | |[[File:L31 305 VORTEC HEAD CASTING ID.jpg|thumb|left|300px|305 Vortec L30 casting ID]] | ||
| + | |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|right|200px|305 Vortec L30 intake port swirl vane.]]<br style="clear:both"/> | ||
| + | |} | ||
==Vortec L31 5.7L heads== | ==Vortec L31 5.7L heads== | ||
The L31 5.7L Vortec casting numbers are '''12559062''' and '''10239906'''. | The L31 5.7L Vortec casting numbers are '''12559062''' and '''10239906'''. | ||
| − | [[File:062_VORTEC_END_ID_001.jpg|left|frame|Casting number 12558062 Vortec head has 3 small humps, aka "sawtooth" on the end of the head.]][[File:906 VORTEC END ID.jpg|right|frame|Casting number 10239906 Vortec head has one large single hump on the end of the head.]] | + | {| |
| − | + | |[[File:062_VORTEC_END_ID_001.jpg|left|frame|Casting number 12558062 Vortec head has 3 small humps, aka "sawtooth" on the end of the head.]] | |
| + | |[[File:906 VORTEC END ID.jpg|right|frame|Casting number 10239906 Vortec head has one large single hump on the end of the head.]] | ||
| + | |} | ||
===Vortec exhaust seats=== | ===Vortec exhaust seats=== | ||
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File:87 96vortec3.jpg|1987-'95 center bolt chamber, left vs. Vortec chamber, right. | File:87 96vortec3.jpg|1987-'95 center bolt chamber, left vs. Vortec chamber, right. | ||
File:Sbc swirl port chamber.jpg|TBI swirl port 64 cc chamber. | File:Sbc swirl port chamber.jpg|TBI swirl port 64 cc chamber. | ||
| + | File:305 VORTEC CHAMBER CN 059.jpg|305 Vortec L30 casting number 12558059 chamber.]] | ||
</gallery> | </gallery> | ||
<br style="clear:both"/> | <br style="clear:both"/> | ||
| − | == | + | ==Some common small block Chevy head ID castings== |
[[File:CastingMarkssbcheads.jpg]] | [[File:CastingMarkssbcheads.jpg]] | ||
| − | <Gallery> | + | <Gallery perrow=3> |
| − | File:041 sbc cast id.jpg| | + | File:041 sbc cast id.jpg|C/n 3947041, "G" below. |
| − | File:292 angle plug.gif| | + | File:292 angle plug.gif|C/n 340292 angle plug "Turbo". |
| − | + | File:Head388.jpg|C/n 3986388; ’68-’79 1.72" x 1.5" valves. | |
| − | + | ||
File:Head450.jpg|C/n 376450; 350 1987-’94 76 cc 1.94" x 1.5" valves. | File:Head450.jpg|C/n 376450; 350 1987-’94 76 cc 1.94" x 1.5" valves. | ||
File:Head487.jpg|C/n 3973487; ’68-’79 76 cc 1.94" or 2.02" valves. | File:Head487.jpg|C/n 3973487; ’68-’79 76 cc 1.94" or 2.02" valves. | ||
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</Gallery> | </Gallery> | ||
<br style="clear:both"/> | <br style="clear:both"/> | ||
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[[File:Sbc head casting id.jpg]] | [[File:Sbc head casting id.jpg]] | ||
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*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's 261, 624. Also 1987-'95 center bolt valve cover-type head c/n 14102191 can also have the 3/8" exhaust valve stem. | *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's 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 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 heads, but without the swirl-inducing vane | + | *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 swirl port heads, but without the swirl-inducing vane are c/n's 14011083 and 14096217. |
| − | are c/n's 14011083 and 14096217. | + | |
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