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12:1 you are gonna probably need an octane additive. I don't think the pump gas is gonna cut it at that ratio.


I will tell you first hand that the 12.5:1 pistons are perfectly fine on 93 octane. I've had the kit on my '04 speedy for a little over 2 years now, and she is a monster in compairison to the 790cc stocker. If I get on her at around 4,000 she will bring the wheel off the ground! Have not once considered putting octane booster in with the gas, but I'm starting to wonder what will happen if I did.



So do you have a stroker kit installed or just 12.5:1 pistons with a 904 BB kit? I have a 904 kit installed but still looking for more.