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Power is very noticeable and its too much fuel for a heavily loaded truck. I have 4 threads showing on the end of the rod and she will get hot when heavy.

Another option is use a sharp chisel and tap counter clockwise to loosen the screw. I think its a 4mm thread. Usually its a 10mm socket.

You wont notice much of anything if you bump the timing up on a stock pump. Adjusting the timing helps when you add more fuel. Due to duration of the fuel injection cycle is very retarded due to safe settings of a stock pump. Also on stock settings, your lucky to get 20 psi of boost which wont...

Look up nevrenufhp on youtube. He has videos specifically for the Bosch MW pump on the 8.3 in the M939A2. I would start with putting an EGT gauge in the exhaust manifold and a boost gauge. Then start playing with the pump. Some of these trucks run hot from the factory and need to have a...