Way back in the dark ages Perfect Circle sold a bench top machine called a "Nurlizer" for shops without a lathe so pistons could be expanded back to standard skirt clearance. Back in the days when engines got 2-3 ring jobs between rebores, it was standard practice to knurl the skirts to compensate for wear. Average life of rings was only 30-40K miles on some engines.

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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!