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buddy, i have the same type of knock, i think it is your CP3.
i have a '06 cummins with:
stage 3 injectors
stage 1 CP3
snow stage 3
and other typical bolt ons
my truck did not start making this noise until i had the pump modified and it only does it when it is above 80 degrees or hotter, if it is cooler out then i noticed it is quite.
i do also adjusted the valves about 3 times. hope this helps you
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