Here's a Nissan Diesel piston that's the same size as a 270 piston. (96MM) There's also a flanged sleeve available that fits with a little creative whittling that allows the engine to be rebuilt repeatedly without reboring it again.

www.ebay.com/itm/195096233829?

www.ebay.com/itm/154178552143?

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!