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I tuned my last big V8 (7.0L +) for higher octane. Also increased thermostat temp from 185 to 195F. Had to rework mechanical & vacuum advance, plus change carb fairly much. But it was worth more than 10% around town. And more fun. Asctge quality of gasoline is nothing like it was in the 1960s (not octane), it was a practical necessity. Not just FE.
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