ok if im running a 12:1 compression on a stock bike then what kind of gas could i use. could i get like 91 pump gas and add 110-114 octane boost or what. any help will be appreciated. aiight den -PEACE-[img]i/expressions/face-icon-small-happy.gif[/img]

 

I ran 93 octane on a 12:1 billet head with no problems.If you go above that then you must use race gas.