Plunger design, the groove in the top of the 215hp plunger accounts for the difference.

oh I knew about the notches but I thought on the timing chart they did not account for that. Thank you weston for the correction

I'm running the timing 19 btdc, I've been doing some asking around and some other folks think that i may possibly have something malfunctioning. Like some delivery valves messed up or a bad injector, he hasn't given me any evidences or indication as to why he thinks this. So i'm not sold on it till he can back it. One thing for certain I need to do a compression test on it and see if any cylinders are down, the motor has a 150000 miles on it bone stock than i stuck it in this Ford and tweaked on it a little, now its up to 170000. I'm not sure but some one once told me that the 97 98 cummins had a 13mm pump not sure if its only standard trannys or for both automatic and standard?

there all 12mm pumps

if the truck idels,runs, and drives fine I dout you have a bad injector or DV