Install the bearings into the connecting rod without installing it on the crankshaft and snug down the rod cap fasteners. Use an inside mic to measure the inside diameter in about 6-8 different places. This way you will get the ID of the bearing bore and you will also be able to tell if the bearing is out of round when installed on the connecting rod.

You could also swap those bearings to another rod to see if you have the same problem after torquing the rod caps down.

You could put the old bearing back in the same rod and see what happens. (both halves)

Good luck...

__________________
Gary


1973 450SL
1999 Silverado 4X4 Ext Cab
1999 Mercury Sable
1972 450SL Parts car

Previously owned keepers:
1967 MGCGT - 3L-6
1972 Mustang Fastback - 351C

Current Cylinder Index: 37