Originally Posted by Red16

doubt they do, otherwise the bearing shells wouldnt fit the same in each bearing cap/block location, meaning they'd either be tight/slack/correct depending which diameter one they were in.

i think its just the way theyre machined at the factory, they have to go back in the same position they were removed from to keep everything as intended, unless you bolted them down and had your machine shop line bore the block, and supply new bearings to suit.