360 Cylinder P.S.I.

If you are getting low compression the quickest way to tell what the problem is would be to do a leak down test. It will tell you way more than a compression test ever will. Pressurize the cylinder with air while the valves are supposed to be closed and look for the air leak, Out the carb - intake valve not sealing. out the exhaust - exhaust valve not sealing. out the dipstick- rings. out the radiator or the next cylinder- head gasket.