The top of that valve looks more like it was hit with a hammer then grinded down by the roller. I think the top of the valve was damaged first during an install, then the rocker was installed on it anyway. The imperfections on the valve probably kept the roller from moving.
You dont need to pull the motor. Pull the heads, clean everything up, and replace the head gaskets. Get some good head bolts and thinner gaskets if you want to make it worth your time.
That really sucks, but look on the bright side, replacing the springs will be much easier with the heads off
