I'll be running 10.1 to 1 in the 427, KC is building for me. Aluminum heads, HR cam. I told Keith that I wanted it to run on pump gas, and that was what he recommended. We have 94 Octane here, so it should run just fine!
Used to run 12.5 to 1 in my old Corvette. I had to run Vortex Octane Booster, though for that!
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
