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Spears sells a +2 mm kit. $1000 us. Oversized 250 pistons will need custom rods or some other tweak to work with the 300 crank. Piston skirt clearance may be an issue? Oversize 300 pistons would need rings for iron cylinders instead of nikasil (i believe... I have been told this but havent found a definitive source on the question.)
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