May I also add to Kelly's post that since the stainless carriers are steel (and so are the outer bearing races), not only do "the stainless steel carriers also expand and contract much less than aluminum components under temperature variations", but they actually expand and contract almost exactly (possible EXACTLY, if the race is the same stainless steel) the same since they are both steels. This really is an ingenous method of securing the bearindgs in these engines which TJT has come up with. Very impressive.