The first engine that I built had low oil pressure... Everyone kept telling me it was the bearings because the oil pump drive gear didn't mesh well and we started it and ran it for a few minutes with low oil pressure.... I didn't buy that short of run time could wipe out new bearings that fast and I was right...
I went to Ken Neve the founder of Mopar Muscle club in Chicago and he gave me the best advice to solve the problem:
Put the engine on the stand and prime the pump... Tear it down a little at a time until you see oil gushing - that will be where the problem is...
Remove the intake, timing chain cover, and oil pan and look for oil gushing out....
That's how I fixed the problem with my engine...
