My cousin is working on rebuilding his Chevy 350 small block. His original motor was completely trashed, and he got this one out of a junkyard and had a machine shop clean and hone the block. Among other parts, it has a new crank. We're in the process of putting it together and we have 2 sets of main bearings: a standard set and a set of .010 over. Drop the standard set in, and the crank rotates freely, but according to the plastigauge has far too much clearance. We dropped the .010 set in, and the clearance shows right, but even with one bearing run down hand tight locks the crank up to where you can't turn it by hand. I've never seen this before and was wondering what ya'll thought.