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Message: [QUOTE="Charles, post: 421285, member: 103"] A head that flows a tremendous amount higher with the same basic port shapes, layout and number would almost certainly have to lose velocity, swirl and efficiency. So since the engine was engineered to produce _____ horsepower, it should come as no surprise that the heads were engineered to also flow sufficient air for that power, and not be designed to flow enough for 6 times that... at the cost of efficiency at the flow rates the head was designed to operate at. As for the cummins, each of those ports is responsible for supporting 32% MORE power than the ports of the duramax or the Ford because it only has 6 cylinders! This means the design flow for those ports will be 32% greater for the SAME engine power at the same engine efficiency. And if you look.... that not coincidentally, is about how much more they flow per port than their V8 brethren... The cummins guys didn't make a head that flowed way more to make more power. They designed a head that flowed about 32% more [i]per cylinder[/i] so that it could support the increased [i]per cylinder[/i] requirements of the 6 cylinder configuration. [/QUOTE]

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