Actually cubes have nothing to do with it at all.
BSFC goes up with power, not cubic inch. It takes a certain amount of fuel to make a certain amount of power. This does change a little when talking the difference between N/A and forced induction because at max power an F.I. motor needs much more fuel added. They typically run at about 11.5:1 AFR versus 13.5 AFR that a N/A motor makes max power at.
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Twin Turbo LS1 '71 Chevelle
1000 hp 93 octane street car
6 speed
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