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These K & N Stubstacks reduce turbulence, improve metering accuracy, and straighten and increase the airflow by reducing restrictions. Hot Rod magazine's flowbench testing recorded an airflow increase of 28 cfm on a 650 cfm carb, and 40 cfm on an 850. This extra airflow builds up to 10 percent more horses. They fit standard bore Holley carbs, and work best with 4 in. or 5 in. tall elements.
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