51, you can be very happy with your oil pressure. I have a freshly rebuilt 59A that has good start up pressure (50 lbs.) . At prolonged idle it drops to 7 psi. I know a knowledgable ex flathead racer and he says that if you have any kind of pressure at all at idle (5-10 lbs.) it is adequate. He,s given me much valuable info over the last few years and has not steered me wrong yet. Steve