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
I hate the deleted post before you hit submit trick!
I understand the need to grind the crank to a consistent size. Are you saying the current bores are too big to machine for a standard sized bearing? Besides thrust is that why you're sleeving them?
Edit!!! Lightbulb just went off. I see why you need the sleeves now.
