I have a 72 gmc truck with a 350small block 4brrl carb with low oil pressure I'm running std bearings now I've tried 10's no good so I went back to std but did not turn the crank with 10's on but I'm still getting low oil readings the pump is new and in the morning I check the oil and it reads full and the only time I hear knocking is at a fast speed and when I let up off the gas pedal could it be the wrong oil weight that would give a low oil reading help
