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what are the typical hp gains seen with a stock bore piston in 11:1 vs the stock 9:1 piston?
 

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I saw noticeable difference I would say its good for about 5hp at the rear wheels is what I saw maybe 6.......a stocker 660 with a pipe and rejet and cdi and aircleaner put down 30 and then i put in a 11-1 and a 45hsr and it jumped to 38-39 at the rear wheels....pulls the big dunes harder too....but you have to be carefull what cdi u run and the gas u put in it to keep if from detonating....only 91 good quality my friend...do head bolts and a good gasket while you're at it...
 

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an 11:1 piston is easy to install,4 or 5 hrs; like Camshaw said about 5 more R/W horse power. But they only like the high test. I'm pulling around 67mph on my 700.With all the bells and whistles.
 
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