Pro Series 98 and Later Ram Cummins 5.9L/6.7L 24V Diesel Cylinder Head Stud Kit

• 35 Chromoly studs deliver stronger, more consistent head clamping force

• 12-point nuts speed torque-down; 3-step 125 ft-lb spec for accurate assembly

• Fits 24V 5.9L (1998.5–07) & 6.7L (2007.5+) Cummins only, not 12V engines

• Complete stud kit engineered specifically for Cummins performance rebuilds

Upgrade your 24V Cummins diesel with a Pro Series head stud kit built to handle the clamping demands of high cylinder pressure, towing loads, and performance builds. Stud-style fasteners help guide the cylinder head into precise alignment during assembly while distributing clamping force more evenly across the head gasket than factory-style bolts, reducing the risk of gasket failure under sustained boost or heavy load.

Machined from 35 chromoly steel with a minimum 190,000 PSI tensile strength, each stud is thread-rolled after heat treatment for added fatigue resistance. A black oxide finish with an oil coating protects the kit from rust and corrosion in daily-driven and towing applications alike.

Installation follows a straightforward 3-step torque sequence up to 125 ft-lbs, with 12-point nuts for consistent, repeatable clamping every time the head is torqued down. This kit is designed specifically for 24-valve Cummins inline-six diesel engines — 5.9L (1998.5–2007) and 6.7L (2007.5–current) — and is not intended for pre-1998.5 12-valve applications.

Applications
Engineered for Dodge/Ram Cummins 24V diesel inline-six engines: 5.9L / 359 ci (1998.5–2007) and 6.7L / 408 ci (2007.5–current). Covers Ram 2500, Ram 3500, and 4500/5500 cab-chassis trucks built on these engine platforms. Not compatible with pre-1998.5 12-valve Cummins engines.

Installation
Torque in three steps: 30 ft-lbs, 75 ft-lbs, then a final pass to 125 ft-lbs, following the correct sequence and any re-torque interval specified for your engine. Studs help align the cylinder head during setup, simplifying placement compared to loose bolts. Confirm stud diameter and length against your specific block before installation.

Will this stud kit fit a 2005 Ram 2500 with the 5.9L Cummins?
Yes. This kit is designed for the 24V Cummins 5.9L (1998.5–2007), which covers the 2005 Ram 2500.

Does this kit work with a 12-valve Cummins?
No. This kit is built for 24-valve Cummins inline-six engines only and is not compatible with pre-1998.5 12-valve applications.

What torque sequence do I need to follow during installation?
Torque in three steps — 30 ft-lbs, then 75 ft-lbs, then a final pass to 125 ft-lbs — using the 12-point nuts included in the kit.

Will these studs help prevent head gasket failure on a towing or high-boost build?
Yes. The stud-style design distributes clamping force more evenly across the head gasket than factory bolts, helping maintain sealing under the higher cylinder pressure seen in towing and high-boost applications.

Does this kit fit a 2010 Ram 3500 with the 6.7L Cummins?
Yes. The 24V 6.7L Cummins (2007.5–current) is covered by this kit, including the 2010 Ram 3500.

Are these studs chromoly steel, or a lower-grade material?
They're machined from 35 chromoly steel with a minimum 190,000 PSI tensile strength, with threads rolled after heat treatment for added fatigue resistance.

Does this kit include the nuts, or are those sold separately?
The kit includes 12-point nuts along with the studs — no separate nut purchase is needed.

Will this kit work on a Ram 4500 or 5500 cab-chassis?
Yes, for 2008-and-later Ram 4500/5500 cab-chassis trucks equipped with the 24V 6.7L Cummins.