Small Block Chevy Head Casting Numbers

Head casting numbers and the head casting date are located under the valve covers, in the rocker arm valley.

Casting Number Year Valves HP Chamber Notes
10088113 86 and up 1.94/1.50 N/A 57cc Late model aluminum Vette heads.
12558062 97 and up 1.94/1.50 N/A 76cc L-31 Vortec castings.
14096217 90 and up 1.94/1.50 300 64 CC Heavy duty casting. Small plug. GM crate 350 heads.
333882 70-80 1.94/1.50 150-180 HP 76 CC Intake flow 137.2 CFM Exhaust flow 95.4 CFM These are crack prone!
340292 73-80 2.02/1.60 300HP and up 64cc . High performance heads. hard to find. angle plugs.
3782461 61-70 1.94/1.50 and 2.02/1.6 250-375 64 CC No bolt holes These are the double humps.
3890462 62-68 1.94/1.50 and 2.02/1.6 250-350 64 CC No bolt holes These are also double humps.
3917291 62-69 1.94/1.50 and 2.02/1.6 275-350 64 CC No bolt holes These are doubble hump heads.
3917292 67-68 2.02/1.60 350HP 64 CC Corvette heads.
3927186 68-72 1.94/1.50 and 2.02/1.6 290-370 64 CC has bolt holes These are the doubble humps as well.
3932441 67-79 1.94/1.50 250 and 255 76 CC Intake flow 152 CFM Exhaust flow 93.2 CFM These have flat seat spark plugs.
3947040 68-70 1.94/1.50 and 2.02/1.6 290-370 64 CC andnbsp;
3947041 68-70 1.94/1.50 and 2.02/1.6 290-370 64 CC andnbsp;
3973414 64-70 2.02/1.6 360 and 370 64 CC Z-28 and Corvette LT-1.
3973487 68-79 1.94/1.50 and 2.02/1.6 165-330 76 CC X casting has 10 more intake cc volume.
3998993 68-79 1.72/1.50 and 1.94/1.50 115-175 76 CC Intake flow 150.8 CFM Exhaust flow 91.1 CFM Heavy duty casting. Small plug.
462624 76-87 1.94/1.50 and 2.02/1.60 Not listed 76 CC These are crack prone!
Casting Number Year Valves HP Chamber Notes
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