Many people mistake misfires for ignition deficiencies, even when they really are AFR-related.
There is a maximum flamefront speed for a given fuel and charge density. Going leaner or richer slows it down. After about 3 AFR points it slows down a lot more steeply.
That's one of the real reasons that people find out experimentally that it's safe to run very rich. Without realising it they are slowing down the flamefront, effectively retarding the ignition.
the quality of the cooling system will have a great effect on detonation.
Water wetting agents in the cooling system might also have their place in keeping combustion temps in check with payoff in detonation reduction and resultant increase in ignition timing
That head is very similar to what we do, but I don't remove quite as much squish as that on the intake side.
Have to agree with Hugh on the det detection tho, with the correct equipment it is quite easy to hear it, even on engines well past 700hp.
Steve, what do you mean by the "GT head cooling"?
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