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3 One of the first steps we took was to carry both carburetors to the UTI NASCAR Technical Institute in Mooresville, North Carolina, and have one of the advanced classes run both across the flow bench. We flowed both at 23 inches of water (different from Holley’s testing, so they won’t hit the same cfm numbers) and found that the standard HP flowed 1,044 cfm while the Ultra HP flowed 1,139—which is an improvement of 9 percent. View Related Article
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