Hey mate over the last couple of years I've posted on several forums including this one chased this low oil pressure problem. I think I've given up and just accepted it as the bearings don't show terrible wear when I strip the motor down. I've checked bearing clearances, used high-volume oil pumps and standard ones, checked the oil gallery plugs etc. I just can't seem to find a reason why the oil pressure is so low. I've taken it into professional engine build shops and they still can't find the problem either. I've spent so much money chasing it that I've just about given up on it. Once I rebuild this engine I was thinking of using my oil priming tool to get oil pressure with the valley and heads off. Maybe I will be able to see something then. I'm going to try a third oil pressure gauge just in case I got unlucky with the first two.
