If you're looking for a main stud kit that will increase the strength and durability of your 5.9 Cummins 1998.5-2007 engine, then look no further than the ARP 247-5401 Main Stud Kit. ARP recommends the use of main studs over bolts whenever possible for several key reasons, including the ability to obtain more accurate torque readings and less force exerted on the block threads. This stud kit also makes engine assembly easier and helps ensure proper alignment of caps every time. So don't settle for anything less than the best - trust the ARP 247-5401 Main Stud Kit to give your engine the performance and durability you demand.