Classic cars forum & vehicle restoration.

[Farmer John]

Hi Ray. Damage to rods and main bearing bores is rectified by grinding mating faces and re-boring to the standard size. More common on conrods as the shells there are more susceptible to spinning, economics are simple, whereas with a block it might be cheaper to replace the block.
John

[V8 Nutter]

When I worked at an engine reconditioner's, a re-ground crank had undersized bearings, re-bored cylinders had oversized pistons. Fords sometimes came with blocks that were bored .015 over size for the main bearings, this was simply referred to as backing

[Ray White]

[V8 Nutter]

I don't very often work on an engine nowadays (retired) when I do its American. I have just ordered bearings .010, .020, whatever no mention of under size or over size not had any problems