[blykins]

Yes, and peak hp rpm.

For instance, speaking in generalities, if you have a particular head and cam combination, then make that head work better, you will get horsepower and torque, plus a higher peak hp rpm. On top of that, if you add even more duration and lift, then you should get more horsepower at an even higher peak rpm.

You can see how good a cylinder head is by how much duration you need to make the engine peak at a particular rpm.