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Old 02-01-2008, 12:39 PM
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How fast is fast enough?
 
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93 octane.... that is an option if you want to keep 10:1. I build my engines to run 87 octane. I think with AFR's and 9.5:1 you could run 87 octane, get decent milage, and have plenty of power. You could even run 87 octane on a 10:1 engine, but you have to build it just right, tune it to the gnat's ***, and hope the car gods are smiling on you.
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