Bearing wear inquiry - Distorted or warped block/crank?
I was wondering the general consensus of my bearing wear.
The engine is a mostly stock 1976 Ford 302. I rebuilt the engine recently. The machinist honed the bores 30 over, no other block work. The original crank was ground 10/10. I replaced pistons and rods. Stock heads with ARP head bolts. Mains use stock bolts. Hydraulic flat tappet cam.
I plasti-gauged the bearings prior to assembly. I'll have to check my notes, but rod bearings were at the tighter end of the allowable tolerances and mains were at the loose end (~.0022).
The engine only has about ~100 or so miles over the last nine months.
I recently noticed a loss in oil pressure and decided to check the filter. The oil in the filter had lots of very fine gold dust with a handful of gold flakes. Oil pressure was 45psi driving, 20psi idle (1000rpm). However if shifted into reverse/drive from a stop, idle would fall to 700rpm, and oil pressure dropped below 10psi.
I pulled the engine and checked the bearings. The bottom main bearing halves have extreme wear. #'s 2,3,4 are almost all copper. 1 & 5 show tapered wear. The top main bearings are worn, but not into the copper.
Rod bearings have some wear, not into copper. The rod bearings are reflecting the surroundings (wood ceiling).
Thanks for any insights!