Main Stud Kit Ford 6.7L Diesel

The ARP Main Stud Kit for Ford 6.7L Diesel (part number 250-5802) is a chromoly fastener upgrade engineered to reinforce the main bearing cap assembly on Powerstroke 6.7-liter engines. This kit replaces the factory bolts with premium ARP studs, providing superior clamping force and fatigue resistance under extreme loads—critical for engines experiencing elevated cylinder pressures from tuning, heavy towing, or extended high-power operation.

The kit features 12-point chromoly studs with black oxide corrosion protection, sized for 4-bolt main configurations standard on 6.7L Powerstroke platforms. Chromoly construction increases tensile strength compared to mild steel OEM hardware, reducing the risk of stretch or failure during peak torque events. The 12-point design provides a larger surface area for socket engagement, minimizing fastener rounding during installation. Each stud is precisely manufactured to ARP's tight tolerances, ensuring consistent preload and even load distribution across all bearing caps—essential for maintaining crankshaft stability and preventing bearing wear progression.

This upgrade is intended for Powerstroke 6.7L diesel owners operating modified engines, frequently towing heavy loads, or running the engine in demanding offshore, agricultural, or industrial duty cycles. Reinforced main studs are a foundational upgrade for any bottom-end reliability build. Installation requires engine removal or significant teardown; professional machine shop or diesel-specialist installation is strongly recommended to ensure proper torque sequencing and preload values. The kit ships at 9.1 lbs and includes all studs, washers, and nuts necessary for the 4-bolt main configuration.