One of the things that got me wondering about this is a guy I know who ran a 4.15" stroker RB combo that ran in the same mid-10s range as my car did at the time. He said he loved the engine, but started hurting main bearings after switching to the bigger engine combo. As far as I know, he didn't have anything but main studs w/ a stock block and a Milodon deep pan... no idea if he did other oiling mods. But him not having bearing issues until going to the bigger crank seemed odd. AFAIK, he could have been running wrong bearing clearances, but you'd *think* he'd have addressed that if it was an issue.