Quote:

what motor did you do the test on? i got a 73 valiant all stock with a 318, 80,000 miles on it and did a comp. test in my auto tech class and i had an average of 145 psi.



TA Care's altitude of 6000 ft puts a 120psi cranking pressure the equivilent of 150 psi at sea level, with certain engine assumptions, but, you get the jist of the difference.

The cylinders that had 130 and held pressure tells me there is a valve in the guage to hold pressure, otherwise all the cylinders would have quickly leaked down. So there may be some other issue.