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Does anybody know the major differences betqween these two heads?  I believe the 670 twin piper as you can find on a '95 Mach 1 has a higher compression ratio than the single pipe 670 as in a '98 MXZ 670 or even the '99 670 HO.

I'd like to transplant a single-pipe head onto a twin-pipe 670 but I'm not too sure about head geometry, squish, etc.

Any insight would be appreciated.

-Rob
 

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Are the part numbers different?
 
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