CNC-Dude, that's just the thing. Comp wants the roller to start on the inside of the valve, and end up at the outside. Several others want it centered on the valve stem. Jim Miller just wants a narrow pattern. Titan wants it to roll from outside in! And that's just the valve side. Most of them don't even discuss the pushrod side. I'm not worried about the actual procedure, I just don't know what to shoot for.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."