I fat fingered a key and erased a long post- - - -I've explained the main bearing modification several times and got either ignored, or even ridiculed by one so-called "machinist" on the forum who's now on my "ignore" list. Machining and regrinding all the crankshaft main bearing journals to a smaller diameter and sleeving the bores in the block eliminates the four different main bearing bores. A small block 400 Chevy main bearing then fits all the way from front to rear and there are permanently installed bronze thrust washers controlling crankshaft end play. It also reduces rotating drag and the end result is more torque out the back end.
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!