Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Need to lower comp. 383 sbc build
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Old 12-13-2012, 04:49 AM
454C10 454C10 is offline
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Your current compression is 11:1
cylinder=785cc
heads=64cc
0.04" head gasket=8cc
flat tops=6cc
deck height= 0

(785 + 64 + 8 + 6 + 0) / (64 + 8 + 6 +0) = 863/78 = 11.06:1

if you use 76cc chambers then the cr should drop to 9.7:1

(785 + 76 + 8 + 6 + 0) / (76 + 8 + 6 +0) = 875/90 = 9.7:1

I would use a good aftermarket 76cc head with a 200cc or less intake ports with a set of headers. However, if you plan to use stock exhaust manifolds then using the 882 heads would work ok.
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