340

MoparMark91 said

Cause I'm buying a standard bore 340 and I've heard some guys go .30 .20 and even .60 but I was hoping to bore it .30

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Hopefully you are actually not meaning .300" overbore LOL. BTW, several of the common performance pistons for the 340 (KB, ICON) are available in .020" oversize with a few weeks of lead time.