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If a spacer helps, then your carb or manifold is too small for your package, if it hurts too big. use a spacer as a tuning device. generaly if a four hole helps more than an open one the carb is too small and vice versa. Remember, comp, stroke, rod length etc play a major role in controlling air speed. Just use spacers to dial in your car, then make appropriate changes.... unless your class won't allow them.
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