I used to buy my circle track competitors' "worn out" 350 Chevy 4 bolt main bearing race engine blocks for scrap iron prices- - - -.060 oversize with some taper wear, and buy eight sleeves at jobbers' wholesale. Then I'd use the blocks as practice projects for my engine machining students. Eventually, some of those fellow racers figured out that they were getting beat by their own junk!
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!