Quote:
Originally Posted by argonaut
I agree that a bigger carb and headers offer little opportunity for improving fuel mileage. I think the HEI might help slightly. More spark energy might get you a more complete combustion and allow you to get equivalent power with ever so slightly less fuel and air.
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Yeah, that's what I'm thinking; probably helps a little, just not the several MPG that I see some claiming. Power from optimized spark/ignition is free though, and any extra free power is good!