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Small Block Heads

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Small Block Chevy Head Casting Numbers

Casting # Years
made
Valve
Size
HP levels
Notes
333882 70-80 1.94/1.50 150-180 76 CC Chambers
Intake flow 137.2 CFM
Exhaust flow 95.4 CFM
These are crack prone!
462624 76-87 1.94/1.50
& 2.02/1.60
Not listed 76 CC Chambers
These are crack prone!
3782461 61-70 1.94/1.50
& 2.02/1.6
250-375 64 CC Chambers
No bolt holes
These are the doubble humps.
3890462 62-68 1.94/1.50
& 2.02/1.6
250-350 64 CC Chambers
No bolt holes
These are also doubble humps.
3917291 62-69 1.94/1.50
& 2.02/1.6
275-350 64 CC Chambers
No bolt holes
These are also doubble hump heads.
3927186 68-72 1.94/1.50
& 2.02/1.6
290-370 64 CC Chambers
has bolt holes
These are the small doubble hump heads.
3917292 67-68 2.02/1.6 350 64 CC Chambers
350 Corvette heads.
340292 73-80 2.02/1.6 300 & UP 64 CC Chambers
These are the 'turbo' heads with angle plugs.
3932441 67-79 1.94/1.50 250 & 255 76 CC Chambers
Intake flow 152 CFM
Exhaust flow 93.2 CFM
These have flat seat spark plugs.
3947040 68-70 1.94/1.50
& 2.02/1.6
290-370 64 CC Chambers
3947041 68-70 1.94/1.50
& 2.02/1.6
290-370 64 CC Chambers
3973414 64-70 2.02/1.6 360 & 370 64 CC Chambers
Z-28 & Corvette LT-1.
3973487 68-79 1.94/1.50
& 2.02/1.6
165-330 76 CC Chambers
X casting has 10 more intake
cc volume.
3998993 68-79 1.72/1.50
& 1.94/1.50
115-175 76 CC Chambers
Intake flow 150.8 CFM
Exhaust flow 91.1 CFM
Heavy duty casting. Small plug.
14096217 90 & up 1.94/1.50 300 64 CC Chambers
Heavy duty casting. Small plug.
GM crate 350 heads.
12558062 97 & up 1.94/1.50 N/A 76 CC Chambers
Vortec L-31 heads
10088113 86 & up 1.94/1.50 N/A 57 CC Chambers
Late Model Aluminum Vette heads
 

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Last Updated:

08/25/99 03:47 PM