Main Bearing Clearances Too

I tried an engine with .004- .0045 once. It had 5 psi pressure when it was normal running temp at idle! I told the machinist this was to much clearance before I installed it, he said it would be alright, well I dropped the truck off to him because he said "It must be a bad oil pump". He put a pump in it, then I showed up a little to early and caught him putting straight 50W oil in it, I told go ahead, it won't make a difference. Cranked it up 60 psi cold. 5 psi hot. Then He wouldn't stand behind it, told me to bad! Luckily it was my truck and not a customers. From then on when I would crank it up, it had that death rattle until it had oil pressure. Not telling you what to do but I wouldn't run accept it..