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A thousand factors come into play here, but 9:1 should be no problem at all on that engine. You'll need to run the highest octane you can find. Here in L.A. the best we can get is 91, but that should do fine with a careful ignition curve.
The domes on the piston will slow flame front propagation which will require more ignition lead for peak power which you may not get to experience on pump gas. Since its just a .125 dome, I don't think it will take you out of the realm of tunability on premium pump gas though.
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