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10.5" Is what I got from Ron Wood (Axtell dyno tuned), and Leo Goff.   That's from the bell mouth to the head.  Hard to beat the power they produced.   Ron Wood told me that the folks at Norton didn't believe his HP claims so they flew him and his 750 short stroke out to the UK so he could prove it. 


But the 16" from the bell mouth at 7500 RPM is breaking new ground.  Requires telescoping V stacks.  More experiments need to be made but if it really works that well then.......


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