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Message: [QUOTE="sideactiondiesel, post: 1349996, member: 5070"] This is very true! what is the air doing when it is going through the intake?? moving right?? so when you have a bigger lift cam the air has to speed up and slow down in the manifold causing a slight pause in flow. You guys know air is dumb it needs direction and it takes a bit for it to be moving before it has a direction. In my theory is that when the air has a direction on where to go it has purpose. And with the intake and exhaust events at the given stock head flow it seems that the bigger the cam the more sloppy it gets. Also the other manufactures are leaving the exhaust valve open longer to supposedly drive the trubin.... well when you open a pop it cracks when you first open it that that's the "hit" or velocity that is what is driving the trubin not holding it open longer.... when injector fires gasses expand driving the piston down buy the time the fuel is all burnt up it has no more oxygen to burn causing a quench or halt in combustion so holding the exhaust valve open isn't doing anything other then moving dead air not expanding air. Now with the factory profile the cam wants to help flow not drive. Hence the introduction of vgt turbos ..Engineers looked at it and said hmmm when egr is open a fixed turbo will drop off ... what can we do to fix this?? well the same concept is used on the cam they want "flow" not pulses or "velocity " I would agree. But in this case the 6.0 can only gain from these timing events as well as velocity created. Hope this helps, I don't really like to get all techy on forum stuff because I am a bad speller and do not have good punctuation, so things can get miss read easy. Nice positive feedback canadian mind :thumbsup: [/QUOTE]