Suggest calling thumper carbs.
High octane fuel in that engine is just costing you hp.
Never run more octane than you need to stay out of detonation.
Higher octane burns slower than lower octane thus, the lowest octane you can safely burn will make the best power.
This isn’t exactly how it works. Higher octane fuel does not burn slower, it merely resists ignition to a higher capacity than lower octane fuel will. Once ignited, it burns just as fast. I’ve done specific testing with non-ethanol 93 pump premium vs 100 octane race fuel. It made absolutely no difference whatsoever in my 10.6:1 451. Over the course of 7 races, I switched back & forth day by day looking for any data variation and found zero. I do like the smell it releases better, but that’s not worth 3 times the price to me.
