Originally Posted by Ply36
Sorry, forgot to mention psi on the other cylinders, they were 150 after just a few seconds of cranking on each cylinder. One cylinder I cranked a little longer and it showed 160 or so before I let up.

I think it was gradual until it became obvious. Performance seemed to be tailing off which is why I did the plugs and wires change


Leak down test will tell you if its a valve or gasket between the cylinders. I would not run it. Blowing between the cylinders wears the block and head surfaces.