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Stroker crank and case borking question

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What would the displacement be of a stock 103 with a S&S stroker crank? My guess is a 113. Is case boring necessary to fit a larger cylinder or for clearance for a larger crank? This is for my general knowledge. Thanks as always for your help. :smile:
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Badbagger, did Ironhorse (Cox) do the install on that S&S?
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