Have you measured the cylinders to see what diameter they are now? You'll only need to bore them enough to eliminate any taper wear and get the cylinder walls straight again. That could be anywhere from .020" to .060" or more, depending on how many times it's been rebuilt already. Measure everything first- - - -then buy parts!

"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!