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Too many variables to ck with a compression gauge, best done by cc'ing at TDC, or, by measuring thru the plug hole, to the top of the piston, with a depth gage, or vernier, and compare with a known diminsion, which would be subject to question also. 2 stock engines might vary quite a bit, due to "parts stackup". That, to me, is the inherit problem, with running "stock engines", too much variation between stock parts, due to factory tolerances, that's why most good engine builders, will "blueprint" you a motor, taking the go-nogo parts to an advantage, ala Briggs, for instance! Bob
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"Being old, isn't half as much fun, as getting there"! Ole Robert I!  |