[1795]

I also wonder to what extent that it would be influenced by the type of carb and intake manifold. I think that a Weber system with an independent runner system would behave more like an EFI than the intake on a four barrel.

I do know that if you do not have two pickups in the fuel cell that even with baffling on hard corners you take the risk of a pickup sucking air instead of fuel as you get low on fuel.

I also think that the length of the race or how long you are running your engine is a contributing factor as well to a safe AFR number. In a short sprint you are probably doing less damage running on the lean side than in a longer race, such as a road course where that heat will build for longer periods of time.