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Message: [QUOTE="6pac, post: 1386551, member: 119357"] I agree with Tom, Cranking pressure has lots of variables, (base gasket thickness, porting work etc, etc) I think this is why manufacturers don,t readily give this info in their manuals, it could just complicate things and lead to a wrong diagnosis of the issue. If your gonna use a compression tester, check the reading when the top ends just been rebuilt with new parts. Whatever reading you get, "save it" & use it as your datum point in the future. For instance, if after a rebuild your pushing 140psi on the gauge & a month later you check again & its down to 120psi, this is a good reflection on top end wear. Without the original reading to go off its nearly impossible to say whether you have worn components or not. Again as Tom has mentioned, the only way to determine wear without the original reading is to strip the top end and physically measure the wear & compare your measurments to the tolerances that are listed in the manual. [/QUOTE]