what rod bearings are you running? I had a set of ENGN BLDRs bearings which ended up being TDC which is Chinese
and I only got 3000 miles out of them before they literally CRUMBLED.... Pissed me off. And yes I had my crank polished, mic'd it, plastigauged it, the whole nine yards. I will only run Clevite now. I had the same issue as you but I run the steel backed guides so I pulled the pan and rolled in all new bearings. Chains dont knock, but rods sure do!
