Ford Aluminum 5.4L Header Swap - All-American Header Test
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Next up was a set of larger 1 7/8-inch headers. The larger headers improved the peak power numbers to an even 500 hp at 6,500 rpm and 445 lb-ft at 5,200 rpm, but there was a slight loss in power below 5,000 rpm compared to the smaller 1-inch headers. View Related Article
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