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Message: <blockquote data-quote="MeanGrn Gt" data-source="post: 192746" data-attributes="member: 8422">compression tests are meant to show you if you have any compression leaks (valves, rings, head gasket etc)What you are looking for is for variance in #'s between each cylinder. There is no exact # you should have because it varies between each engine and how tight tolerances etc are. Generally if you are within 10% everything is in good shape. If one side is higher than the other that is probably head gasket difference. If ya have one cylinder that is low it is either the valve leaking or a ring. Squirt some oil in the cylinder and if it fixes it than it is a ring if not then it is a valveYou are supposed to keep cranking until the it stops building pressure. The motor looks like it is in good shape for having 160k. Mine which was supposed to have been rebuilt shortly before i got it was within 2 psi so i was happy.</blockquote>