There is no spec, F5. Typical readings are over 100psi and all cylinders in a 10% range of each other. The range is the important thing. Measured psi can vary all over due to so many variables.
thank you ancient mariner, did you happen to read my first post on wot issue, if not i would appreciate your insight. im going to check compression this evening
My '86 90 blew approx 120 a hole after a rebuild awhile back. Ain't checked it recently tbh but as JB said: Uniformity is the main issue. So long as they're within reasonable range of each other and not too much lower than 100psi y'oughta be okay.
