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Octane is a measure of knock resistance. More octane will burn slower and not want to explode (knock). A higher octane will not produce more power. More powerful engines run the high test to match wild compression ratios, not because the gas has more bang in it.

Run the lowest octane that doesn't knock with your preferred spark advance.

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Thank you. A very sensible answer!

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My first GTX had a somewhat built engine though I never knew the exact specs. Maybe compression was between 10.1-10.5 to 1. It would ping at WOT on 93 octane and have a slight power lag at 1000-1400 rpm. Running a mix of Sunoco race gas to 93 octane boosted it to around 98-100. With that octane it had no pings, much improvement on the hesitation, and even ran a tad cooler.

I tried various octane "boosters" and none did a darn thing regardless of what they claimed. I'd even add the bottles when the tank was getting low to maximize the effect. A waste of $$. It was actually cheaper back then to add 1-2 gallons of race gas than it was to add an octane booster.
At least with the race gas you were getting a set qty of real octane.

RR69s

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