Thread: Loss in Oil Pressure

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So today I used a priming tool and noticed that I could build roughly 15psi at full drill speed which is somewhere around 2000rpm. I relocated the oil pressure tap to the oil tap towards the timing cover instead of the oil filter housing and pressure went to 19psi but the heads are still not getting any oil. We only primed for about 20 mins. Everything seems to point towards a stuck open pressure relief valve. Any other suggestions before I pull the engine again. Also the oil seems heavily saturated with molylube, could this have any correlation with my problem?

Same thing happened to my brothers 496 but it started out with 60 psi then dropped down to about 15 psi. We messed around with the fittings the gauge. Finally we just dropped the oil and put Rotella 15w-40 started it back up and back to normal. We thought we where going to pull the engine too until we did that. The oil almost looked a little milky maybe from all the assembly lube I don't know. Still good oil pressure to this day. Good luck