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As you can see here, the inner runners of this small-block Chevy are shorter, whereas the outside runners are longer. When trying to balance the air/fuel ratios according to weather changes, drag race tuners would compensate with carb jet changes, but that still doesn’t allow them to address the cylinders individually depending on rpm. By mechanically controlling when the valves open and close, COMP’s found a way to more evenly distribute the mixture across the board. Makes sense to us.