The 2nd-generation 235's have steel-backed insert bearings with multiple layers of metal in their construction. Some of the inserts have Babbit as the bearing surface, while others have different alloys. The inserts can be changed without going through the scrape-fitting process that was common with the 216 and early-type 235 rods with the bearing material bonded to the rod. The crankshaft journals still have to be round, and the right size.
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!