Diesel engine performance and reliability hinge on proper cylinder sealing, especially under high-boost conditions. Replacing stock head bolts with quality head studs helps maintain clamping force, resist head lift, and improve long-term durability for 6.7L Cummins builds. This guide highlights five top head stud kits and related options that fit 1998.5–2021 Cummins 5.9L and 6.7L engines, with emphasis on strength, compatibility, and install practicality. Each product is evaluated for material quality, tensile strength, and compatibility with boosted or tuned setups.
| Product | Brand | Key Strength | Notes |
|---|---|---|---|
| Xotic Performance CP876 Head Stud Replacement Kit | Xotic Performance | 220,000 psi | Centerless ground, easy installation |
| Tamirey Cylinder Head Stud Kit (5.9L/6.7L) | Tamirey | 220,000 psi | Wide vehicle compatibility, strong chromoly |
| Gator Fasteners Heavy Duty Head Stud Kit | Gator Fasteners | >220,000 psi | High tensile, quick install features |
| DK Engine Parts ARP Head Gasket Kit (6.7L) | DK Engine Parts | Reinforced ARP studs | Includes head gasket studs kit |
| FLAMPETUS 12-Point Head Stud Kit (1998–2020) | FLAMPETUS | 220,000 psi | Chrome/moly 12-point design |
Xotic Performance CP876 Head Stud Replacement Kit
The Xotic Performance CP876 kit is designed for 1998.5–Present Dodge Cummins 5.9L and 6.7L diesel engines. It uses XOTIC 7200 material, delivering approximately 220,000 psi tensile strength, higher than standard 8740 chromoly studs. The threads are rolled after heat treatment to boost fatigue resistance, supporting consistent clamping under high-performance boost. The kit includes broached stud ends to ease installation and cylinder head removal, along with an installation manual featuring diagrams. It is specifically built to maintain seal integrity under extreme turbo pressures.
Tamirey Cylinder Head Stud Kit (1998.5–2021)
The Tamirey kit targets a broad range of Cummins 5.9L and 6.7L diesel engines from 1998.5 to 2021, including Ram 2500/3500 models and later 4500/5500 variants. Made from hardened chromoly alloy with a tensile strength around 220,000 psi, these studs are designed for boosted or high-load applications. The kit emphasizes reliable sealing and post-heat-treatment thread rolling to improve fatigue resistance, helping prevent head gasket failures under demanding conditions.
Gator Fasteners Heavy Duty Head Stud Kit
Gator Fasteners offers a heavy-duty head stud kit for Dodge/Ram 1998.5–2021 5.9L and 6.7L Cummins diesels. The product highlights a tensile strength exceeding 220,000 psi and a maximum load well over 120 kN, with included installation instructions. The design focuses on robust clamping force and ease of use during installation and head removal, making it suitable for stock repairs or tuned setups where reliable head sealing is critical.
DK Engine Parts ARP Head Gasket Kit (2007–2017 6.7L)
This DK Engine Parts kit combines head gasket components with reinforced ARP studs for 2007–2017 6.7L Cummins engines. The kit targets head gasket integrity and improved clamping strength, with emphasis on reliable sealing under high-heat diesel operation. It pairs head gasket parts with ARP studs to support robust engine builds that endure increased boost and fuel delivery pressure.
DK Engine Parts ARP Head Stud Kit Oil Cooler
This head stud kit variant includes ARP studs with an oil cooler integration option for 2007–2017 6.7L Cummins engines. It focuses on reliable head sealing and oil system compatibility in boosted applications, ensuring integrated cooling support while maintaining high clamping force for durability in demanding diesel builds.
WYNNsky Head Stud Replacement Kit (1998.5–2018)
WYNNsky provides a comprehensive head stud replacement kit for Cummins 1998.5–2018 models, including 5.9L and 6.7L engines. The package includes 20 M12 x 160mm studs, 6 M12 x 168mm studs, 26 nuts, and 26 washers, delivering an all-in-one solution to complete a head stud upgrade. Materials and design emphasize durability under high-temperature, high-pressure diesel operation and improved engine stability through stronger head-to-block connections.
FLAMPETUS 12-Point Head Stud Kit (1998–2020)
The FLAMPETUS kit uses 12-point nuts and 8740 chromoly steel studs, nominally rated at 220,000 psi tensile strength with a black oxide finish for corrosion resistance. It targets 1998.5–2020 Dodge Cummins 5.9L and 6.7L models, replacing the 247-4202 part. The kit includes 26 studs, 26 washers, and 26 corresponding nuts, designed for straightforward installation and reliable sealing in boosted engines.
Buying Guide: Key Purchase Considerations
Material and strength: Look for studs manufactured from high-tensile chromoly or equivalent alloys, with tensile strengths around 220,000 psi. Post-heat-treatment thread rolling enhances fatigue resistance and clamping reliability under boost.
Fitment and compatibility: Confirm the kit supports your exact Cummins year range (1998.5–2021) and engine variant (5.9L or 6.7L). Some kits also include compatible gaskets or oil cooler components—verify alignment with your build plan.
Installation considerations: Kits with broached ends or clearly laid-out installation diagrams save time and reduce installation risk. If you plan substantial turbocharging, prioritize seals and the ability to maintain head gasket integrity under higher pressures.
Included hardware: A complete kit should include studs, nuts, and washers with the correct thread pitch and length for your cylinder head and block deck. Some sets also bundle additional hardware for heads and intake surfaces.
Application goals: For stock performance, standard high-strength studs are usually sufficient. For tuned or boosted setups, emphasize higher clamping force, fatigue resistance, and compatibility with upgraded gaskets or ARP hardware where applicable.
Warranty and supplier support: Choose brands with documented testing, clear installation guidance, and responsive customer support to address installation questions or compatibility concerns.