All six connecting rod bearings failed but the main bearings look like new. All crankshaft bearings are original.
Oil pump looks like new.
No sludge in engine. Was using 10W-40 oil when oil pressure started to drop to 19 psig at 2000 rpm and then dropped to 11 at idle. I also had added PTF to the oil. I switched to 15W-40 then to another grade of oil but no change in oil pressure. Then I opened the engine and found totally failed connecting rod bearings.