quote=polyspheric]A 12:1 motor with good ring seal needs the intake closing way up in the 80's ABDC to show 150 psi on a gauge,

Does it? [/quote]

Cam card shows:

IO @ 31.5

IC@ 71.5

EO@ 85.5

EC@ 29.5

PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure.
..... Now its a door stop....