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144 case mod question.

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I am currently building a 144 out of a 06 rm 125. the top end is at harris performance in texas right now getting done. i am wondering how much i have to take off the cases for piston clearence. i starting to take some off, i went about a 1/8th" back and about a 1/4" down is that going to be enough or do i need to take more off.

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