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The factory rocker arm bolts on the 6.7 Powerstroke are torque-to-yield fasteners. They stretch, they can only be used once, and they offer very little margin when you step into higher valve spring pressures or upgraded cam profiles. The Ontork Rocker Arm Stud Kit fixes all of that with a high-strength, reusable solution designed for anything from stock builds to extreme performance engines.
Built from premium material and rated at 221 KSI tensile strength, these studs provide the clamping force and stability the factory bolts can’t match. Whether you’re installing rockers during a routine service or building a high-RPM, high-boost setup, these are the correct fasteners for the job.
The factory torque-to-yield bolts on the 6.7 Powerstroke can stretch, lose preload, and create inconsistencies every time the valvetrain is serviced. They are one-time-use fasteners that offer little margin when exposed to higher spring pressures, aggressive cam profiles, or elevated cylinder pressures. Over time, this can lead to instability in the valvetrain and poor torque retention. The Ontork stud kit eliminates these issues with a stronger, reusable design that keeps the rocker arms properly secured in everything from stock builds to high-performance applications.
These studs provide far greater strength and durability than the factory torque-to-yield bolts, ensuring reliable clamping force under stock or high-performance valvetrain loads.
No more replacing bolts every time the valvetrain is serviced. The Ontork stud-and-nut design is fully reusable, saving time and money while improving reliability.
The stud design makes rocker arm installation quicker and more accurate. The rockers locate naturally on the studs, reducing the chance of misalignment compared to factory bolts.
Whether you’re running stock rocker arms, upgraded valve springs, a high-lift cam, elevated boost levels, or a hard-use towing setup, these studs provide the strength and consistency your valvetrain needs.
Designed to fit all 2011+ 6.7L Powerstroke cylinder heads, including 2011–2019 and 2020+ engines.
Ontork fasteners are engineered to solve OEM weaknesses with purpose-built hardware that performs under real load, heat, and RPM. This rocker arm stud kit is no exception— stronger, reusable, and built to stabilize the valvetrain in any 6.7L Powerstroke application.
NOTE:Installation requires torquing to 15 lb-ft for the rocker nuts & 70 lb-in for the oil rail nuts.
