Description
ARP head studs replace the factory torque-to-yield head bolts with reusable, precision-made studs that deliver higher, more consistent clamping force. They are the go-to upgrade for keeping the heads sealed and preventing head-gasket failure on modified, high-boost or rebuilt diesels. Studs thread into the block by hand, so all torque is applied on one axis for accurate preload, and the block threads are spared from repeated bolt cycles.
ARP part number: 247-4204
Application: Cummins 5.9/6.7L 24v 1998.5+
Material: ARP Custom Age 625+ superalloy (approx. 260,000-280,000 psi tensile strength)
Fitment
- Cummins 98.5-02
- Cummins 03-04
- Cummins 04.5-07
- Cummins 6.7 07.5-18
- Cummins 6.7 19+
Features
- Custom age 625 plus super alloy
- 235k-255k psi yield strength
- 260k-280k psi tensile strength
- Includes chrome moly steel 12-point nuts
- Black oxide coating for improved corrosion resistance
- Centerless ground to ensure they are perfectly concentric
- Improved clamping force prevents cylinder heads from lifting
- Broached stud ends install & make cylinder head removal easier
- Heat-treated prior to thread rolling and machining for optimum fatigue strength
- Shot-peened to remove any surface irregularities and upgrade the overall external integrity
What's Included
- Head studs
- 12-point nuts
- Hardened parallel-ground washers
- ARP assembly lubricant
ARP installation instructions & torque specs (PDF)
Always follow ARP's published torque values and use the supplied ARP lubricant for accurate preload.
