The Babbit isn't completely round to begin with- - - -there's a tapered area on both the rod and the cap at the parting line that's a few thousandths bigger. (just like an insert bearing- - - -they're not round either, where the soft metal meets the crankshaft). Bolt up a connecting rod with a bearing in it off the crankshaft sometime and do some measuring.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!