Rebuilt Engine bearing wear

This noise is a very rhythmic knock. Definitely sounds like a rod. Let's say that the bearing and crank journal is good (which they both should be). What could cause rod knock? The bearing cap? I just don't see how putting fresh bearings in caused it to have rod knock. This noise wasn't here until I replaced the bearings. It did have this noise on the first day with the old bearings... almost like it had to wear them in. But that's not how bearings work... idk

Unless you have all your rod caps numbered, it is easy to get them on the wrong piston rod combo.

Connecting rods and their caps are machined as one, don't get them mixed up or you will start to get knocking sounds.