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Discussion Starter #1
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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Moved to Skidoo

Are the part numbers different?
 

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That head will work on the 95-96 machs if you cut it. 95-96 cylinders are 1mm taller than the single pipe cylinders.So to retain the right squish clearance of .065-.070 skidoo cut the head.
 

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Discussion Starter #5
</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (HotM1 @ June 27, 2002, 06:07am)</td></tr><tr><td id="QUOTE">That head will work on the 95-96 machs if you cut it. 95-96 cylinders are 1mm taller than the single pipe cylinders.So to retain the right squish clearance of .065-.070 skidoo cut the head.[/b][/quote]
So,

If the twin-piper cylinders are 1mm longer, I can shave ~0.040" from the single-pipe head to have the same squish, correct?

Just want to be sure.
 
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