On engines with all the main bearing bores the same size, like a small block Chevy V8, there's another procedure that's a lot more common, called "align honing". A long expandable abrasive mandrel similar to a connecting rod hone that can span all the main bearing bores is used to correct minor misalignment between them after taking a slight skim cut off the mating surfaces of the bearing caps. The downside of this process is that the same amount of material is removed from the block and the caps. On inline engines like the stovebolt Chevy and other GM inlines such as Buick, Pontiac, Oldsmobile, etc. it would be necessary to use a stepped-diameter hone that would be difficult to manufacture and almost impossible to keep in alignment as the honing stones got a little wear on them.
Jerry
