SBC cylinder head identification
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To distinguish the nuances, there are several things that can be used to ID cylinder heads: | To distinguish the nuances, there are several things that can be used to ID cylinder heads: | ||
| − | ; | + | ;Casting number |
:Usually cast into the head as opposed to being stamped, the casting number is usually the best thing to use to tell what a cylinder head was originally used on and its potential for performance use. | :Usually cast into the head as opposed to being stamped, the casting number is usually the best thing to use to tell what a cylinder head was originally used on and its potential for performance use. | ||
:The casting number may be out in the open where it can be easily seen, like the Pontiac V8, or somewhat harder to see but still visible without taking anything off the head, or the number can be under the valve cover or under the head where it's difficult to see without some amount of disassembly. | :The casting number may be out in the open where it can be easily seen, like the Pontiac V8, or somewhat harder to see but still visible without taking anything off the head, or the number can be under the valve cover or under the head where it's difficult to see without some amount of disassembly. | ||
| − | ; | + | ;Casting date |
:Like casting numbers, the date code is usually cast into the head, and may or may not be visible without removing the valve cover. | :Like casting numbers, the date code is usually cast into the head, and may or may not be visible without removing the valve cover. | ||
| − | ; | + | ;Secondary identifier(s) |
:These are often stamped in instead of cast, like in the case of some 1970's Pontiac heads. | :These are often stamped in instead of cast, like in the case of some 1970's Pontiac heads. | ||
| − | ; | + | ;Casting identifiers |
:This is different shapes that may be (in the case of the SBC) on the end of the heads or elsewhere. | :This is different shapes that may be (in the case of the SBC) on the end of the heads or elsewhere. | ||
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===Fuelie casting identifiers=== | ===Fuelie casting identifiers=== | ||
| − | [[File:462 double hump head.gif|left|frame|thumb|SBC cylinder head casting number 3990462, c/n 378461 similar | + | [[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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|[[File:L31 305 VORTEC HEAD CASTING ID.jpg|thumb|left|300px|305 Vortec L30 casting ID]] | |[[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 | + | |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|right|200px|305 Vortec L30 intake port swirl vane]]<br style="clear:both"/> |
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{| | {| | ||
| − | |[[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: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:906 VORTEC END ID.jpg|right|frame|Casting number 10239906 Vortec head has one large single hump on the end of the head.]] | ||
|} | |} | ||
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So both the c/n 906 and c/n 062 heads have virtually the exact same performance potential. In fact there are instances like for marine use where the hardened exhaust seat insert is actually preferred over the induction hardened seat. | So both the c/n 906 and c/n 062 heads have virtually the exact same performance potential. In fact there are instances like for marine use where the hardened exhaust seat insert is actually preferred over the induction hardened seat. | ||
{| | {| | ||
| − | |[[File:Induction hardened seat vortec.jpg|thumb|center|400px|Induction hardened Vortec exhaust seat | + | |[[File:Induction hardened seat vortec.jpg|thumb|center|400px|Induction hardened Vortec exhaust seat, note the discoloed area around seat]] |
| − | |[[File:Hard insert seat vortec 906.jpg|thumb|center|400px|Hardened insert Vortec exhaust seat | + | |[[File:Hard insert seat vortec 906.jpg|thumb|center|400px|Hardened insert Vortec exhaust seat]] |
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File:Sbc swirl port chamber.jpg|TBI swirl port 64 cc chamber as used on the c/n 14102193 and 193 heads. | File:Sbc swirl port chamber.jpg|TBI swirl port 64 cc chamber as used on the c/n 14102193 and 193 heads. | ||
File:Tbi swirl port vane.jpg|TBI swirl port vane as used on the c/n 14102193 and 193 heads. | File:Tbi swirl port vane.jpg|TBI swirl port vane as used on the c/n 14102193 and 193 heads. | ||
| − | File:305 VORTEC CHAMBER CN 059.jpg|305 Vortec L30 casting number 12558059 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"/> | ||
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