Based on the limited info you provided, here are a few numbers. If you were making 400 HP at 9.6 CR, you would make 404.43 at 10.7 CR If you were making 500 HP at 9.6 CR, you would make 505.54 at 10.7 CR. 10:1 would be a better target and very safe . Many will tell you you can easily run 11-11.5:1 on pump gas with aluminum heads no problem. And they are absolutely right because lots of new cars do that every day. But they have computer controlled engine management systems with knock sensors, O2 sensors and port or direct fuel injection. An old Pontiac with a carburetor and no electronic controls can do it too. But you better know how to tune it just perfect. Too fine a line for my taste. BTW, my numbers came from a Wallace calculator of CR vs HP.
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