Quote:
Originally Posted by Steve C.
As I understand it the stock published compression ratio was often more than actual compression ratio. Probably vehicle and/or engine specific.
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I once calculated that in my particular case, the 'advertised' compression ratio would be correst if the piston top was at the top of the cylinder, there were no valve reliefs and no head gasket, and their was zero space around the piston above the rings. I don't know if it just worked out that way in my case, or if that was the general practice in 'advertised CR' by GM, or just pontiac.