If you choose to do a big overbore, be absolutely sure to weight-match your replacement pistons with the originals. On the round track race engines I've built over the past 40-something years, I weight-match anything that moves down to 1/10 gram- - - - -a dollar bill weighs one gram. Then we do a dynamic (spin) balance after that.
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!