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883 - 1200 head differences for 04+

883:
1.585" intake
1.350" exhaust
49.5cc chamber (they vary wildly though).
7mm valve stems (vs. 5/16 for 03 & older)


1200:
1.810" intake
1.575" exhaust
62cc combustion chamber
7mm valve stems

They can easily support .550 of lift right out of the box, where all the older heads were only safe to about .500.
 
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