There is plenty of air getting to the cylinders to run a compression test even with the throttle closed. The gage was bad, the check valve is broken . The valves and rings are good with the results of the leak down test (10% at 90 PSI). So the the compression test would have been good. I'll do the compression test when the MATCO truck comes back Tuesday just to see the numbers, and my own piece of mind.
Spencer