The pics are of a stock 6.2 pump. The first pic is of the governor assy, gov guide stud, and fuel metering valve. The second pic is a side view of the head/rotor assembly removed from the housing. The leafspring/allen screw side facing the camera. The third pic is looking into the housing at the camring and driveshaft. The 4th pic is of the plungers, leafspring, and rollers. (from top to bottom) The last pic is a picuture of the rollers vs. the plungers size wise. (.38" vs .29") The main difference between a stock 6.9 or 6.2 pump and a 7.3 or 6.5 is the plungers size. (.29" for the little motors and .31" for the turbo motors) There are some timing differences between the two also. The holy grail, so to speak, is the marine head with .33" plungers. Or the DB4 with 4 plungers...
I do all the work on my pumps. I have some crude but effective tools that get me in the ballpark and final tuning is done on the engine. I have a few different things in the works right now and hopefully I can report about them tomorrow if things run correct...