New Blazer 1972 - Got Questions ;-)

[old man jimmy]

First off, make sure you have all your plugs out when checking comp. Your Alt. shouldn't make any diff. Don't know where that 200 psi came from. But i'd say more in the range of 175 tops. More important that they be uniform. If you have a low one, give a shot of oil in cyl. crank a few times and check again. if it comes up, it's rings. If not probably a valve. also make sure you get three or four strokes before checking your gauge.