Gentlemen, I can tell you the oil pumps on all the Chevs are more than adequate. Fact is, they're actually too big on most every engine I've ever seen. Mains need very little pressure. Rods need the flow to keep them cool. 3# idling warm and 14# on hiway warm is correct on the dipper Chevs. Idling, the rods dip in troughs. As rpms build, the oil stream arc increases providing 10 times the oil pressure you see on the gauge !! As a professional builder of these engines for more than 6 decades, I'd never replace an oil pump, unless damaged. And certainly not with something bigger. I blueprint rebuild pumps.
