Several years ago, I was able to use a set of 270 piston rings on a 256 engine by widening the compression ring grooves in the pistons to fit the only rings that were available. It was a pretty simple procedure, using a 4 jaw chuck on my lathe and a parting tool. I also straightened a twisted connecting rod. To the best of my knowledge, that engine is still running.
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!