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i need to rebuild a '77 1000cc ironhead and i was wondering if anybody knows of a conversion kit to 1200cc or better? thanks
 

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yes S&S still makes it bore size can be increased but it aint cheap, Trock Cycle specialties
 

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trock cycle still make big bore cylinders for this application 3-7/16 or 3-1/5 and a 3-5/8 for all out racing add some stoke and have a good time 3-7/16X4-5/8 light port clean up v9 cams big exhaust valves cv carb weeee haaaaw
 
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