Knock after rebuild

Got around to trying this out tonight, I noticed no difference on any cylinder when pulling the plug wire. I could be totally imagining things as I still hear the knock bit it did not seem as loud tonight. So far I have run the engine 1 hours in the garage and put 15 miles of regular driving. I drained the warm oil into a clean pan tonight and everything looked good.  I let it set a while and ran it past a magnet and found 2 really small specs of metal on the magnet. No bearing dust or anything out of the ordinary so far. Using the stethoscope tonight I am less sure where the sound is coming from. On the side of the oil pan I think I hear it in all cylinders. Any other ideas.  Should I drive it a bit and drop the pan or drop the pan now?

Lee's post stirred a long forgotten memory for me. Years ago I had a knocking sound on my empire tractor. Dropped the pan, removed the rod and main caps and all was well so I put it back together and ran it thinking it may be a wrist pin. I ran it some more and noticed the crank pulley wobbling a bit and suspected that may be the source of my knock. Sure enough, when I dismantled my tractor for restoration, the crank diameter were the pulley was mounted was way undersized. That was the source of my knocking.   

Check valve lash adjustment ? 

I'm not a L-Head expert. I'm use to OHV motors burning oil when the guides or stem seals go bad. I didn't think it was an issue with the L-Head. Just trying to see if there was something else going on prior to tear down. I will let the engine experts resume their diagnosis. 

My Jeep spent 30 years in my grandpas back yard with no hood and the plugs out. When I restored the Jeep I didn’t do much to the engine other getting it to run.  It ran good for 4000 miles and started to smoke and smell like fuel and exhaust. I did the valves, guides and rings at that time. I made my first error when I did not use the correct bearings when I put it back together, that’s when I started down this road. 

A bit too much scoring. How clean was the inerior of the motor?

The engine was tore down completely and hot pressure washed inside and out.  The crank came from Kaiser willys and the bearings came with it.  I was going to do the crank locally but with Covid the lead times were crazy. It was 20 over on the mains and 60 over on the rods.  I plastic gaged at time of install and it was right is spec. I did not do any other checking. 

Sorry about that, I miss spoke. The crank was obviously undersized and the bearings seem to check out upon assembly. I did pull all of the oil galley plugs and cleaned everything with high-pressure water and a brush. I also cleaned all of the holes out on the new crank. Affected to see some thing on the number three or four cylinder because that’s what I originally thought I heard the knock but I did not expect to see it on my number one cylinder as I’ve never had a problem up there. Did not hole number three Because I was tired of getting oil dripped on me so I can check that one tonight. Is the fact that the main bearing looks brand new and indicator that there is not metal traveling through the system?