The way I make con rods with bushed and split big end, bore the hole to take the bronze for the bush, fit the piece of bronze, either a light press fit or Loctite, drill and tap for the big end bolts, now split the bearing and fit the bolts, bore the bearing to size. Usually I drill the bronze before fitting if its been in the lathe to take the OD down to size. Not too practical for main bearings, but one thing is, the bearing can't rotate in the housing, it's oval on the OD.
Ian S C