No clue- - - -If I was facing that decision I'd just make a bushing on the lathe, press it in, and fit it in place with an expandable reamer for the proper clearance. That's not an option for most hobby engine builders, however. I'd suggest measuring the hole in the block and looking for a standard-size bushing that might be a good fit.
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!