You can only change lift. The lobe is re-ground and it's "profile" is altered, allowing a + or - in lift, depending on what you want. With us, we could use a tad bit more lift. How much we can get is unknown at this time as I have not ventured in that direction yet. We have to get them CNC machined for various reasons, and if it comes down to this option then, so be it.
I am still confident we'll get a new cam