The oiling system on a stock chevy is oustanding. Too much oil pressure is as bad as not enough. It will wash the bearings out, the oil needs to stay on the bearing long enough to lube and carry heat away. too much pressure passes the oil across the bearing to fast to do either. A high volume pump will suck the pan dry, not good. On a properly clearanced engine, stock oiling system is excellent, only a very few engines require a drysump or alteration of the oil system. This is just my opi.