2.285" is not a correct undersize, no matter what the Plastigauge says. Here's a few correct measurements:
STD.- - - - -2.311-2.312
.010" undersize- - - -2,301- - - -2.302
.020" undersize- - - -2.291- - - -2.292
.030" undersize- - - -2.281- - - -2.282
A 20 under bearing will be sloppy loose, and a 30 under will lock it up.
Jerry