That 261 might be a good candidate for the Nissan Diesel forklift piston and sleeve setup I discovered recently. Those flanged sleeves are a snug slip fit once the block is bored and honed, so the block could be rebuilt repeatedly without any more machine work.
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!