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The Boss uses the Turbo Swirl Aluminum cylinder heads that have an advertised intake/exhaust flow of 240/170 cfm at 0.550 lift. They flow better than the original iron GT-40 heads and are 25 pounds lighter. They use 1.94/1.54-inch valves, have a 178cc intake and 62cc exhaust, and can use either the GT-40 manifold or aftermarket intakes, headers, and valve covers. View Related Article
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