monte70car Posted May 16, 2014 Share Posted May 16, 2014 So we picked up our free big block from at garage friend. I ran the numbers checks out to be a 74 454 with 230hp what is the stock compression of the motor. The block code is CXA with the heads ending in 781. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted May 16, 2014 Share Posted May 16, 2014 should be 8.25:1 Quote Link to comment Share on other sites More sharing options...
monte70car Posted May 16, 2014 Author Share Posted May 16, 2014 Thanks Sam Quote Link to comment Share on other sites More sharing options...
7tonemonte Posted May 16, 2014 Share Posted May 16, 2014 Sam lives for this! wealth of knowledge, and a pretty cool guy too! Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted May 16, 2014 Share Posted May 16, 2014 but if you use the same pistons and heads and use a newer head gasket that is , say .039-.041 thick, it will drop the compression down a smidgen, say approx 8.0:1 Quote Link to comment Share on other sites More sharing options...
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