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Head cam change - fuel consumption?

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What happen to the fuel consumtion if I rebuild my 1993 model 180 hp Stock 350 small Block (1st gen) With Vortec heads and an cam with lift around .5?
I already have exhaust system, carb etc that will handle it.

I expect the consuption to raise, but how much?
100%? 50%? 20%? Nothing?

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