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Message: [QUOTE="White_monster, post: 421214, member: 594"] #1 manifolds were designed to make the engine quieter and smoother feeling in the cab. They get the power needed from factory just fine so there's no need for the extra flow possibilities. #2 the heads flow perfectly fine for the stock power. Sure the others flow more but why spend money making the heads flow more than is needed, you really think Ford or International care that we want to modify these trucks, I think not. #3 extra head bolts add cost. Make them bigger and use less means less cost and more profit. Also the block is ultra close to the 6.0L so it most likely saved a pile on retooling. Again all comes down to profit. #4 Not sure but maybe it was cost or international is connected with Siemons some how. [/QUOTE]

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