It use to be the standard on the rod bearing being wider, more oil clearance at the rod joint to allow a build up of oil to, (puddle) help lubricate the bearings better as the rod rotated on the cranks wrench scope
I'm thinking between .0003 to .0005 additional clearance scope

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)