Quote:
Originally Posted by HO455
You can ball park the compression ratio by doing a compression test of the cylinders. My 10.75:1 GTO is 185 to 190 psi with a Ram 4 cam. Lots of test results on the interweb to compare yours to. You would at least have some idea and also know if all the cylinders are relatively in the same condition.
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Recently did this, 155 ish psi.