kt,
when you have the rods machined,they put little locating notches in the rods, for the inserts. There are two things to be careful of:
1)If those notches are not the correct width apart, the two bearing halves will not line up and you can end up taking up all the side play.
2) Secondly, sometimes the notches are not quite deep enough and this can cause the bearings to bind. In that case it is necessary to grind a little of the locating tang off, so that it isn't as deep.
If you have new wrist pins that are snug, that can stop the rods from snapping back and forth. With a newly machined engine with inserts, you should use plasti gauge for checking clearances.
