3406b missing allen screws from pump??

I have a 3406b cat sn# 7fb36124 pump sn# 7w3906. This truck is new to me and after running it for a while I thought I would try turning it up a little for more power on the hills. When I pulled the cover off itblooks like the outside Allen screw and lock nut are gone. So kinda at a loss of what to do now. The truck doesnt get hot only 700egts post turbo. So I thought I might have been stock but iii doesn't seem like it. Any help on what to do would be great thanks in advance

 

Not that I know of it looks like the original. The motor is in a 1985 Peterbilt 359. The previous own told me the motor had an inframe 2 yrs ago and that tge motor was a 400hp 3406b but my cat dealer said it left the factor as a 310hp model. So maybe the p.o. pulled the screw for more hp on the rebuild? But I still have the screw closest to the block what do I do with that one? I'm just looking for a little more power for the hills. It only makes 15lbs of boost and post turbo egts are 700 degrees max with the pedal to the floor and grossing 78k.

 

Any other thoughts??

 

If it had a hole wouldn't I still get all the the full just not the boost to clean it up? I would think that my egts would be way higher than 700? Also how to I check the diaphragm? I've pulled off the first cover to bottom out the little screw. Would I just take more off or what?

 

Okay thanks, I'll check it when I get home from running this week. Is it hard to replace o read that it's best to have a a cat tech replace it but I don't have anyone that's familiar with these b models