Ford Aluminum 5.4L Header Swap - All-American Header Test
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The real reason for the huge power gains offered by the headers was the wild cam timing. The combination of aggressive specs (lift and duration) and cam settings (significantly advanced) resulted in plenty of cam overlap. It was the overlap that produced dilution of the intake charge with the stock exhaust manifolds. Since there was no overlapping of the ports with the long-tube headers, the power was up significantly. View Related Article
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