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CHEVY Mania!

HEADS

Casting # Years
made
Valve
Size
HP levels
used for
Notes
33388270-801.94/1.50150-18076 CC Chambers
Intake flow 137.2 CFM
Exhaust flow 95.4 CFM
These are crack prone!
46262476-871.94/1.50
& 2.02/1.60
Not listed76 CC Chambers
These are crack prone!
378246161-701.94/1.50
& 2.02/1.6
250-37564 CC Chambers
No bolt holes
These are the doubble humps.
389046262-681.94/1.50
& 2.02/1.6
250-35064 CC Chambers
No bolt holes
These are also doubble humps.
391729162-691.94/1.50
& 2.02/1.6
275-35064 CC Chambers
No bolt holes
These are also doubble hump heads.
392718668-721.94/1.50
& 2.02/1.6
290-37064 CC Chambers
has bolt holes
These are the small doubble hump heads.
391729267-682.02/1.635064 CC Chambers
350 Corvette heads.
34029273-802.02/1.6300 & UP64 CC Chambers
These are the 'turbo' heads with angle plugs.
393244167-791.94/1.50250 & 25576 CC Chambers
Intake flow 152 CFM
Exhaust flow 93.2 CFM
These have flat seat spark plugs.
394704068-701.94/1.50
& 2.02/1.6
290-37064 CC Chambers
394704168-701.94/1.50
& 2.02/1.6
290-37064 CC Chambers
397341464-702.02/1.6360 & 37064 CC Chambers
Z-28 & Corvette LT-1.
397348768-791.94/1.50
& 2.02/1.6
165-33076 CC Chambers
X casting has 10 more intake
cc volume.
399899368-791.72/1.50
& 1.94/1.50
115-17576 CC Chambers
Intake flow 150.8 CFM
Exhaust flow 91.1 CFM
Heavy duty casting. Small plug.
1409621790 & up1.94/1.5030064 CC Chambers
Heavy duty casting. Small plug.
GM crate 350 heads.
1255806297 & up1.94/1.50N/A76 CC Chambers
Vortec L-31 heads
1008811386 & up1.94/1.50N/A57 CC Chambers
Late Model Aluminum Vette heads

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