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Power Strokes
6.4 Aftermarket
Cylinder heads: Ported vs Stock?
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[QUOTE="White_monster, post: 120131, member: 594"] Well heads are needed on big turbo trucks cause the turbos push way more air. I did the math and my max powers push 1953cfm's of air. Stock heads flow 160cfm each cylinder do that equals 1300cfm's, I did my math wrong earlier. So right there you have way more air in the system than can be used. The ported heads flow around 260cfm each cylinder and that equals 2080cfm's. So now your able to flow all the air from the turbos thru the heads but again the stock manifold is your bottle neck. It flows about 150cfm on the rear cylinders and about 240 on the front cylinders. A ported manifold gets rid of the restriction to the rear cylinders and makes all cylinders get equal amount of air, think it usually works out to about 240-260cfm each plenom. So if you put heads on the truck but don't do a manifold that flows the same you are not getting max potential from the heads. Hope this clarifies this issue. [/QUOTE]
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Cylinder heads: Ported vs Stock?
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