The blocks we were buying from Chevy dealer parts departments 3 or 4 at a time to build round track engines came with a roughed-out bore size .005" UNDER standard bore diameter. They were intended to be bored and/or diamond honed to whatever bore size and piston skirt clearance the engine builder chose. Most of the racing teams I hung out with were building 3-4 engines a season, and if one had a thousand miles on it, it was considered to be an antique- - - -destined to be sold to a second-tier team. "There's no substitute for cubic dollars" in the round track game.
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!