340 to 372 stroker kit

JBurch said
I do not for a second deny that the smaller main bearing diameter on a 340 crank produces less friction than the main diameter of a 360 crank, however, I have never ever seen, read, heard, witnessed on a dyno chart any factual information that makes this a relevant statement........at what HP level, at what rpm does this become relevant?? When I see this statement put up in discussions of the merits of building a 340 based engine over a 360 it is to me IMHOP very much akin to spending the OP's money...he already has the block, help him find pistons and rings for a 4.1 inch bore, that would be alot more meaningful than the suggestions for going to a 4 inch stroke crank

Smaller bearings mean lower operating speeds. Higher bearing speeds degrade the oil film that may cause metal to metal contact. Smaller bearings are easier on the oil film.

A big old bearing in a land yacht like a big Olds or Chrysler is likley to never stress the oil to any degree. But repeated 6000 rpm blasts down your favorite back road in your MAY... another reason to use a good oil if you are inclined to hit the go pedal whenever possible.

There's a reason endurance engines like smaller rod bearings (and main bearings)... 1.850 and 1.88 are the norm right now.