SBC cylinder head identification
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===Fuelie casting identifiers=== | ===Fuelie casting identifiers=== | ||
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| − | + | |[[File:462 double hump head.gif|thumb|350px|SBC cylinder head casting number 3990462, c/n 378461 similar]] | |
| + | |[[File:Fuelie end ids1.jpg|thumb|350px|Various double hump identifiers]] <br style="clear:both"/> | ||
| + | |} | ||
==Vortec L30 5.0L 305 head casting number 12558059== | ==Vortec L30 5.0L 305 head casting number 12558059== | ||
{| | {| | ||
| − | |[[File:L31 305 VORTEC HEAD CASTING ID.jpg|thumb|left| | + | |[[File:L31 305 VORTEC HEAD CASTING ID.jpg|thumb|left|390px|305 Vortec L30 casting ID]] |
| − | |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|right| | + | |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|right|180px|305 Vortec L30 intake port swirl vane]]<br style="clear:both"/> |
|} | |} | ||
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==Various SBC chamber and port comparisons== | ==Various SBC chamber and port comparisons== | ||
<Gallery> | <Gallery> | ||
| − | File:Early chamber left vortec right.jpg|Early 64 cc chamber, left vs. L31 5.7L Vortec 64 cc chamber, right | + | File:Early chamber left vortec right.jpg|Early 64 cc chamber, left vs. L31 5.7L Vortec 64 cc chamber, right |
| − | 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. L31 5.7L Vortec chamber, right |
| − | 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> | ||
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<Gallery perrow=3> | <Gallery perrow=3> | ||
| − | File:041 sbc cast id.jpg|C/n 3947041, "G" below | + | File:041 sbc cast id.jpg|C/n 3947041, "G" below |
| − | File:292 angle plug.gif|C/n 340292 angle plug "Turbo" | + | 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: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 |
File:Head882.jpg|C/n 333882; ’70-’80 76 cc 1.94" x 1.5" valves. | File:Head882.jpg|C/n 333882; ’70-’80 76 cc 1.94" x 1.5" valves. | ||
</Gallery> | </Gallery> | ||
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*'''B-''' Narrow triangle over rectangle c/n 520, 896, 1958 and up 283 PowerPak and 1957-'60 FI. 9.25:1 CR, 1.72" x 1.50" valves, 59cc nominal chamber volume. Could be used on a 305 but no accessory holes and has unhardened exhaust seats. | *'''B-''' Narrow triangle over rectangle c/n 520, 896, 1958 and up 283 PowerPak and 1957-'60 FI. 9.25:1 CR, 1.72" x 1.50" valves, 59cc nominal chamber volume. Could be used on a 305 but no accessory holes and has unhardened exhaust seats. | ||
| − | *'''C-''' Vertical bar over rectangle c/n 997, 1957 Corvette 270 HP, 9.5:1 CR, chamber similar to | + | *'''C-''' Vertical bar over rectangle c/n 997, 1957 Corvette 270 HP, 9.5:1 CR, chamber similar to Power Pak but with sharp corners in plug area. |
*'''D-''' 2 vertical bars over rectangle, c/n 997, 1956 Corvette 2X4-bbl 283; 1958 passenger car FI; chamber same as 1957 270 HP Corvette. | *'''D-''' 2 vertical bars over rectangle, c/n 997, 1956 Corvette 2X4-bbl 283; 1958 passenger car FI; chamber same as 1957 270 HP Corvette. | ||
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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 492. | + | *'''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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*'''L-''' Right-facing “bench” c/n 993. Common large chamber smog head, not a lightweight casting. Similar to c/n 487. Used on the SBC 400, so may have steam holes and 1.60" exhaust valves. Hardened exhaust seats. | *'''L-''' Right-facing “bench” c/n 993. Common large chamber smog head, not a lightweight casting. Similar to c/n 487. Used on the SBC 400, so may have steam holes and 1.60" exhaust valves. Hardened exhaust seats. | ||
| − | *'''M-''' One triangle c/n 882. Alternative marking for 882 (see '''I''' above). Hardened exhaust seats. | + | *'''M-''' One triangle, c/n 882. Alternative marking for 882 (see '''I''' above). Hardened exhaust seats. |
| − | *'''N-''' | + | *'''N-''' Two triangles c/n 624. Late model lightweight casting version of c/n 882. Said to be crack prone. Used on Corvette and Camaro high performance engines with 2.02" x 1.60" valves. Hardened exhaust seats. |
*'''O-''' “Saddle” and vertical bar c/n 416. Late-model 305, conventional perimeter valve cover, intake port not restricted, lightweight, 57 cc nominal chamber volume. Hardened exhaust seats. | *'''O-''' “Saddle” and vertical bar c/n 416. Late-model 305, conventional perimeter valve cover, intake port not restricted, lightweight, 57 cc nominal chamber volume. Hardened exhaust seats. | ||
| − | *'''P-''' Double (Captain’s) bars c/n 193. Used on TBI equipped engines. Mid | + | *'''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. |
==SBC heads to avoid== | ==SBC heads to avoid== | ||
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*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. | *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. | ||
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==Resources== | ==Resources== | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:undeveloped articles]] | [[Category:undeveloped articles]] | ||
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