? Valvetrain Geometry ?

Wow!! Them look worse than the ones I had. What brand are they John? Do you have a way to measure the valve stem height? That can also cause geometry problems. If the valve stem isn't high enough it causes the rocker to run off the edge. Stock heads valve stem height measures 1.9" from the spring seat to the tip of the valve.

BTW: The ones I had were rolling close to the edge too and I finally just put the stock arms and pushrods back on and they rolled perfectly center and made no noise.