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does any one know if you can take a set of heads from a 98 xcr 700-triple triple-and put them on a 96 xcr600sp-triple triple-to increase the compression.is this practical
 

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No, I believe the 700 cc are bigger diameter or else it wouldn't be a 700 cc machine. If you mean a 96' xcr 700, you can do it i am pretty sure.
 

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NO!!....you will decrease compression since the 700 had a bigger chamber. Mill your 600 heads if you want compression
 
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