The lobe lift is limited to about .515 or so, and the next thing is cam core flex, which limits the rate of lift along with limited lobe profiles. Duration isn't limited, so you can go way too far with that. I don't know just how much the cam core flex and twist affects the motor, but I am sure it is quite measurable. The gen III Hemi has a very large cam core to allow high rates of lift with limited duration, and may also be bigger to offset cam twist. This brings up the question, best answered by cam engineers, of how much different installed centerline the bigger cam cores need to address cam twist in the older cam core size. If it is significant, then there is the answer. That would be compensation for cam twist.