I see no 'performance' Ford/IH diesel sub-forum here so I will just post this here. The rocker arms in the picture are from a 6.0L, but the thread can be dedicated to any Powerstroke displacement concerning the rocker arm and building this portion of the valve train for more severe duty applications. This weekend I had the time to sit down and actually look at these ones and measure.
These are rough measurements, not exact but it gives you an idea of them.
Top rocker arm from Pushrod cup to pivot = 1-27/32" + or -
Tip/nose to pivot = 2-17/32 + or -
Should be noted the tip or bridge contact point of the rocker is removable, moves as needed for operation too. I will display the rocker scrub on the valve bridge too to show the movement the rocker itself does during engine running time. These rockers just so happen to be 3/16" thick material.
The bottom rocker
Pushrod cup to pivot = 1-5/16" + or -
Tip/nose to pivot = 1-27/32" + or -