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Old 07-28-2012, 11:46 AM   #1
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Anyone know how large the exhaust port sizes are? designed? How exactly is internally ported? Im just wondering? Basically is it like having headers internally ported, and thats how the gained the extra HP? sorry noob question.
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Old 07-29-2012, 10:29 AM   #2
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I'm not sure but you should move this to the lfx section.
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Old 07-29-2012, 05:17 PM   #3
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They gained the extra horsepower because the exhaust manifold is actually INTEGRATED into the head. It's not like a regular head with 4 exhaust ports that then bolt to an exhaust manifold. In this case the exhaust manifold is part of the head and you just have a large single port which the exhaust pipe bolts to.

The interesting part is that THEORETICALLY people could pop their heads off and port both the heads and the "exhaust manifold" for increased flow instead of having to buy headers.
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Old 07-29-2012, 06:34 PM   #4
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port matching is what i am looking into the next week or so i was told there is mm's to remove to increase flow from open port to exhaust drop
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