Got the pistons up to TDC (thanks for the tip to use distributor as a pointer) and the pressure gauge set to 100PSI. Leakage is 5 -10% on five cylinders, one is at 18% which I can smell gas as if air is coming out the carb so most likely a intake valve leak. Gauges are a bit fussy, they creep up if left hook up to the supply air. Also I get a 5% difference if I set leakage to zero see photo as compared to setting pressure gauge to 100psi. Anyway it is an interesting test, I think I will test my 1962 Ford 600 tractor. I've been debating about rebuilding that engine. So unless you guys have a different opinion, I would say the rings are good and just have the head redone. Thanks for the help If someone knows of a good head guy in the northern Detroit area (Warren,Utica or Sterling Hgts) please send my way.
