not sure on the specifics of the other criteria of the bearings (most importnatly width). However, you can get a machine shop to cut your block/line bore or turn your crank to run whatever bearings you want to run. However if we are talking a motor for IT this is not legal and woudl typically put your motor out of factory spec, thusly illegal. I know I spec out bearing clearances to the ten thousandths of an inch for both my main and rod clearnaces (among other things) for my machinist, within the factory tollerances, to help me achieve goals that I am trying to achieve.
<- one of the ones that experimented with using acura main bearings on domestic V8's to reduce the amount of surface area=less friction=more power.
<- also runs ford 300 I-6 bearings in his ford SBF 347 stroker motor.
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