[dtw]

It is pretty easy when doing a DIY rebuild to improperly install the chain ramps. They can be fiddly.

It is feasible, as mentioned above, to replace them with engine in-situ.

Knocking sound could be some remaining chunk of chain ramp getting knocked around in the sump area. Still, I would second the suggestion to get an oil analysis done (if you dumped the oil into a clean bucket).

In the meantime, pull your oil filter and cut it apart, and take a look for rod bearing material in the pleats of the filter (you'll be seeing more of that black plastic material too). Was the sound a very regular rhythmic knock, or more like dropping a spoon into a garbage disposal kind of random and chaotic?