FUEL PRESSURE AND VALVE ADJUSTMENT

[JWEAVER]

Need help! I have a 2019 x15 performance series, truck started smoking and skipping, machanic done a cut in cut out test it showed cylinder three no change. They are saying its a burnt valve. Suggesting rebuilding at 500 thousand which im fine with if were solving the problem but im trying to figure out if the injection pressures are the same on the x15 performance series versus a 2017 isx engine or am i looking at different pressures? Weve read that these fuel pumps are or were causing a problem. Do the valves take the same valve lash as the 2017 isx? Thanks for the help willing to pay for help. Weve talked to numerous cummings care employees and have gotten several different answers and more confused now than we were to begin with and thanks again!