impossible? 360 magnum. Ran the drill and the oil gauge stuck at 60 psi. Installed a known good gauge. Read 250psi. Split the oil filter. Oil is getting all the way to the rockers. New cam bearings, rod. 0027, mains .003. Original factory hydraulic rollers. Pulled the pan and pump. Relief valve is shimmied with a washer
080-.100" . Relief valve moves freely. I'm surprised the pump could even make that much pressure. 5w30 oil. I'm stumped. Is the shim the issue?
Doug