1997-2006 Cummins 5.9L Main Stud Kit (247-5401) 6.0L Runs on factory calibration —

Runs on factory calibration — no tune required

For dedicated tow rigs and daily drivers

1987-2020 Cummins 5

You are using a box tuner or no tuning at all

1997-2006 Cummins 5.9L Main Stud Kit (247-5401) 6.0L Runs on factory calibration —1997 2006 Cummins 5. 9L Main Stud Kit (247 5401) Strengthen the bottom end of your 5. 9L Cummins with the ARP Diesel Main Stud Kit 247 5401 from OCDiesel. ARP recommends the use of main studs over bolts whenever possible for several key reasons. First is the ability to obtain more accurate torque readings because studs don't "twist" into the block. All clamping forces are on one axis. By the same token, there is less force exerted on the block