With the arm the way it is the centre of gravity is just forward of the pivot point.
Therefore there is no pressure from the arm on the valve.
Yet the pivot point could be moved more towards the cam and this would move more of the weight forward decreasing the chances of pressure on the valve.
If people want a roller follower on the arm that is easy to do as well.
What about an eccentric for exhaust valve adjustment ?
Any ideas bring them up and I will draw them, remember I am not building one of these (yet) so whatever you want just say.
Then as soon as everybody who is in on this build is happy with the end results I will put out drawings for the different parts.