Put my engine back together yesterday. Hours and hours of cleaning parts.
Kevin was right. None of those bearings were bad. Finished the farm-boy rod bearing replacement. SAME NOISE! Dang. I should have done the mains too.
Wait a minute. What about these ol' idler pullys? Pull the belts off the front = no noise!
Start to put the AC belt back on and find 2 inches of belt chunked out!
Replace 2 belts with new spare belts. Start up. No noise.
All that downtime for nothing more than a belt!