That's a damn good question. Maybe since I used old rods the cap may be worn. But the bearing would still show wear... the machinist gave me a bore scope. Looked fine. Wrist pin moved fine when I swapped bearings. Machinist said it doesn't sound like a rod knock. More like something hitting. But that doesn't make sense since it goes away when u unplug cylinder 2. Basically the machinist said see if it goes away or drop the pan and maybe put the old bearing back in.