Real Steel do the bearings in various sizes. 2" is the size but I seem to remember the bearings being narrower? Maybe Buick rather than regular small block Chevy? It's been 13 years since I built my Chevy journal motor!
I think he means the actual rod journal size on the crank for measuring tolerances not the bearing size as that's 2" std.
I kind of need to know too as I've just had rod bearing failure so hoping my calculations are right!