Mopar Main Stud Kit - 5.9/6.7L Diesel

The ARP Mopar Main Stud Kit for 5.9/6.7L Diesel engines is engineered for operators and enthusiasts who demand absolute reliability under extreme load conditions. This chromoly main stud kit with 12-point nuts is purpose-built for Dodge Cummins diesel platforms, replacing factory two-bolt mains with ARP's industry-standard fastening solution. Whether you're running stock power or aggressive tuning, this kit addresses the critical weak point in high-output diesel engine architecture—the main bearing cap interface where catastrophic failure begins.

ARP chromoly studs with black oxide finish deliver superior clamping force and fatigue resistance compared to OEM bolts, critical in 5.9L and 6.7L Cummins engines where combustion pressure and boost levels create cyclic stress on the block. The 12-point nut design ensures precise preload torque application and eliminates rounding risk during installation and future servicing. The two-bolt main configuration is factory-compatible, requiring no block modifications while providing the strength margin needed for dependable operation at elevated power levels. Weighing 4.76 pounds, this complete kit includes all necessary fasteners for a full main bearing cap replacement.

Installation requires careful torque sequencing and ARP's recommended assembly lube to achieve proper preload; this is non-negotiable for long-term engine integrity. Diesel technicians and performance builders recognize ARP studs as the industry standard for Cummins platforms experiencing higher boost or extended duty cycles. Proper installation ensures the main bearing cap remains solid under extreme cylinder pressure, preventing micro-movement and the bearing wear that leads to engine failure. This kit is essential for any 5.9/6.7L Cummins owner prioritizing reliability and resale value.