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The reason the throttle response is better is because that with one big blade, when you open that carb versus a regular carb the same amount, the SV-1 is letting a lot more air in.........You could do the same with a progressive linkage on a regular 4 barrel.........Just set it up to where the carb opens a lot with very little throttle cable movement......

There's NO WAY that carb will make your motor make more vacuum.........Vacuum is what it is.......

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Kinda like putting a gear drive and extra set of squirters on the old 950 3 barrel I know, I'm dating myself