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I rebuilt Harley engine a few years back and upgraded to 10:1 pistons, hotter cam, sent heads to California to Branch Flowmetrics to change combustion chamber, enlarge valves, port and polish, etc.. They did extensive flow testing and dyno runs with their products. Their strong advice was run higher octane to help with pre-detonation but also the higher octane helped engine run cooler.
We also run aircraft engines on airboats here in Florida and advice from aircraft mechanics, was the same, regarding the operating temperature. Since we are in Florida heat and operating at sea level and not 5000' up, where air is cooler, we run 100 octane LL. even though some older engines were rated for lower octane.
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