This engine only has about 10 hours run time on it. The balancer is new and a prostreet type, but that is a valid concern of it being old.
Trailbeast, come to think of it, when tearing down the junkyard block for rebuild, the bearings were trashed, all the metallic layers were showing and they crumbled in half in my hands. Likely why the truck (which was an automatic) was in the junkyard in the first place. That being said, I'm sure the crank journal where #3's thrust bearing rides took some excessive wear. During install, I simply pried the crank and torqued the cap. I should have done a full blueprint on this engine but unfortunately didn't, so I don't have the actual endplay measurement, but I feel it was on the low end.
Needless to say, I'm putting down some power to this crank, 13 lbs of boost worth (10 psi if I were at sea level). I'm sure thats close to 450 torque, so I was wondering if I it's possible for #3 bearing cap to come loose or shift a little? It's hard to say.
As always, thanks for all the knowledge and advice. I'm gonna try and upload a video cause everybody enjoys a video.