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  1. Gen2Cudas

    318 exhaust manifold has a buterfly flap??

    You find these on the passenger side manifold- they are a diverter of exhaust heat into the intake manifold crossover passage (original equipment iron single plane 2 barrel) to help warm up and atomize the fuel/air mix "better" during cold startup. Think of it as a Jurassic attempt at improving...
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