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Old 12-12-2009, 10:32 PM   #8
bmweuro
Mad Scientist
 
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Joined: Nov 2003
Location: Chico, California
Oddometer: 3,397
I have built a lot of airhead race motors in the past 25 years and this is an area I would not tuch on a street bike. If you ever rev the motor you will crack a lifter and on the street you will never notice the added performance. If your looking for cheap reliable horse power in a Boxer you can do 2 things.

up the compression and port match the heads.
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