Rocker adjustment
From published sources....
The rocker arm in mechanical valvetrain systems often has clearance issues with the valvespring and retainer and also with the pushrod cup. Most mechanical rocker arms have a relief under the arm near the valve tip for retainer clearance and a relief on the underside of the pushrod arm to clear the cup-end. As the cam lifts get higher, the outside diameter of the valvesprings increases. These issues must be addressed.
From published sources....
The rocker arm in mechanical valvetrain systems often has clearance issues with the valvespring and retainer and also with the pushrod cup. Most mechanical rocker arms have a relief under the arm near the valve tip for retainer clearance and a relief on the underside of the pushrod arm to clear the cup-end. As the cam lifts get higher, the outside diameter of the valvesprings increases. These issues must be addressed.