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Message: [QUOTE="Charles, post: 1529360, member: 103"] I don't have much experience gaining anything worthwhile through heads, cams, valves, intake or anything else. I squeeze the air harder if I need more oxygen and that never fails. Moving more air is hard. Moving heavier air is not. The only 7.3 I'm aware of doing anything of substance in the airflow department would be something like Ben Miller or hypermax in the 2000+ hp range fuel only. I have no idea what they might be doing to positively affect volumetric efficiency, but they would be who I would ask if I cared. A number of cams have lost power despite having great SOTP feel. Anybody suggesting that they have meaningful gains through head or cam work on a 7.3 I greet with serious skepticism. I would say that 50 to 80rwhp (dynoed) from head/cam changes to be a very good job on these engines. That's not ever really appealed to me as being worthwhile considering the negatives usually involved. The heads on the engine I just fired last week have some in chamber and port work so when I start driving around I can see if there's any drivability change, although I also went to B code VOP, so it will be hard to tell which is which and losses down low may be masked by the VOP. [/QUOTE]

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