When they machine the rods to take inserts, the inserts are precision parts, just like modern rods. Thus if your crankshaft is within standard spec, then the insert gives the correct fit. What I did was use .001 inserts and shimmed as necessary.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!