? Valvetrain Geometry ?
Looking quick, the shafts are too low. What happens is the rocker tip ends up starting inside the center of the valve stem centerline, then as the rocker goes thru the lift motion, it gets to the outside and stops. The motion of the rocker is an arc. You need the arc reduced to just the part that is perpendicular to the centerline fo the valve. That's how you get the most lift action with the least power robbing friction, and the wear that accompanies it. It also cuts down on the pushrod rubbing and rocker/spring clearance issues on a lot of engines. The pushrod length is the last thing you check, and on my engines, the last part ordered are the pushrods.