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If you are just swapping manifolds without tuning on the jetting and especially the accellerator pump circuit, you are not making a valid comparison. A richer carb set-up will favor the single plane and a leaner carb set-up will favor the dual plane. The question is how is the carb is in relationship to the rest of your engine to start with.

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I don't think you are giving the Victor a fair shot with out tuning the carb.