I'm not sure I understand your point. I'm not saying "my way only", I'm saying what the laws of physics dictate. Octane and resistance to detonation are very specifc. As I said, SOME do "get away" with it. As a professional, I am required to give solid advice based on facts AND experience, not emotions or "brand loyalty". You WILL find, running 9.3:1 with the proper internals will make more usable power than a higher ratio and making "adjustments" to compensate.
10:1 with aluminum heads works okay. Aluminum "soaks" much of the heat from the combustion process, thus resisting detonation. The "downside" to that is not that you "can" run higher compression, but you MUST. All factors being equal (flow, static compression ratio, camming, etc.), iron heads will make more power than aluminum due to this "heat sink" property of aluminum. There have been tests done on Chevy engines regarding this. All the way through the tests, the author kept saying it didn't make much difference, until the "end" where the actual dyno numbers were posted, and the iron-headed engine made more power across the "board". Dart "Iron Eagle" and Dart "Pro-1" were the heads used.
