Just a note on checking bearing clearances without micrometers . This is done in all machine shops, can also be done with engine insitu. First check crush by tentioning bolts and then releasing one of the bolts, then check how far cap moves up with feeler gauge, .006" would be the minimum. If okay then remove cap and place piece of gloss magazine paper on cap and retension. If crank locks up or becomes firm to turn you know the clearance is less than the paper thickness. Gloss paper is normally .004". If crank still turns easy insert piece of news print on top of gloss and crank should lock solid. News print is usually .0025". The nominal clearance for copper lead brgs is .002" to .004". this is an extremely accurate method of checking crush and clearance. This can also be used on rodshells. The more i read these posts the more i think the under done cap bolts are a big part of the reason for falling oil pressure by growing and releasing some tension, This can also lead to less crush and allow brgs to spin. Is there an aftermarket oil cooler available.?