my 383 dodge dart finished

wineland3 said

just the flap top 40 over bore kbs with valve reliefs. and 30 thous of inch gaskets and the heads are 80cc combustion chamber which gives me exactly 10.2 compression

ps the kbs are based on 84 cc chambers which is 9.5 to 1 since these are 80cc i got just over 10 to 1

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What did you use for a compression ratio calculator ?

When I plug in the specs and ASSuME that you had the block decked to zero the pistons I get 9.53 given your .030 thick gasket , don't know what gasket that is ?? , 4.290 bore , 5cc valve canyon/relief and 80cc head.