What do you think that soft metal middle layer is on an insert bearing? Oh yeah- - - - -it's Babbit! The pricey "race-only" bearings we paid twice as much for as "street" bearings- - - -they're made with a slightly thicker Babbit layer- - -without the .0003" thick pure tin layer on top for quick break-in, and an extra thousandth of oil clearance. Babbit is actually BETTER and longer-lasting under high-load and extra clearance conditions than the softer insert bearings that replaced the poured and scrape-fitted ones, plus it can have the clearance adjusted repeatedly by shimming!
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!