Sort of a side note, but...the first time I saw the cam and rocker setup I was reminded of BMW's arrangement. The rocker travels in an "arc", putting pressure on the walls of the valve guides. I used to see lots of BMWs with worn guides at a relatively low mileage. I also did quite a few 300Es under warranty....there would seem to be a connection there somewhere since oil consumption problems went away when the cam and valve arrangement changed.
Just a Thought,