I have never dealt with broken main caps. GMC is my thing, and they had precision bearings as far back as 1939. I have helped guys shim Chevs with Plastigauge to get correct clearance. But I wonder if a cap that came off of another engine would match side to side line bore. I wouldn't sink money into an engine that had replacement main caps and no line bore done. And what caused them to break in the first place.
