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Well I found a source for the 70mm pistons for dirt cheap. Would it be worth the extra cost to machine the cylinder? Overheating issues? Probably not not worth it unless you have access to a machine shop and want to play. These motors are a dime a dozen but machining costs do add up. Cam grinds could be played with.
Quiet a bit could be taken off the head to up compression and the valves would still not be close to the piston.
Anyway, just playing a thinking out loud.
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