low oil pressure

I had the same problem on my freshly built 340 and I had to put a bigger pan on it. I think it's a combo of things mainly loose bearings and your pumping more oil out of the pan then stock and add on top of that some g forces complicating things. If things were to stock specs a stock pan works great but at add some wear on the bearings and go fast parts and things don't work like they should.