Recent content by Yurzi

The air cut off valve has nothing to do with cylinder psi. It just adds air to the exhaust in order to help burn up gasses for emissions. Its normal to see carbon build up there. The entire system is often removed, and block off plates added to the valve cover. It is not necessary for the...

Dethwshbkr has it right, you need to cut your spacers (part 13, 30 in diagram) by an amount equal to the excess spring length. You have no sag now because you have way too much installed preload.

If flushing or burping the radiator doesn't do anything replace radiator cap with a new one. The springs on them wear over time, lowering system pressure and causing overheating issues.