HomeA Brief HistoryARP ManufacturingFAQARP CertificationsContact Us

Automotive Racing Products produces the highest quality
American Made High Performance Diesel Fasteners

for the Cummins, Powerstroke and Duramax diesels.

ARP Diesel Head Stud Kits for Ford Powerstroke, Dodge Cummins, and Chevy / GMC Duramax Diesel TrucksARP Diesel Head Stud Kits for Dodge Cummins Diesel TrucksARP Diesel Head Stud Kits for Ford Powerstroke Diesel Trucks - Click here for more


If you own an American made pickup with a turbo diesel engine, and you want to upgrade its performance and power level, you will need Premium American Made Fasteners from ARP to keep it together.

ARP (American Racing Products) was the creation of former aerospace engineer and machinist, Gary Holzapfel back in 1968. The initial product line consisted of head stud kits only.

The ARP line of high performance diesel parts now includes head stud kits, rod bolts, main studs and flex plate bolts for all American models and versions of performance diesel pickup engines. These premium=quality, proven fasteners are available for your Dodge with the famous Cummins 5.9L and 6.7L, Chevrolet/GMC with all versions of the 6.6L Duramax, and Ford with the 7.3L, 6.0L, 6.4L and 6.7L Powerstroke. Several versions of the ARP of premium grade alloy head studs are available with strength ratings between 160,000 and 280,000 PSI. ARP has designed and built proprietary application-specific alloys for each intended application. These ARP Diesel head Stud kits are designed for the customer looking for better towing and power output all the way up to the diesel competitor.

ARP 247-4202 Cummins Diesel Head Stud Kit is for the 5.9L and 6.7L Dodge 24 Valve Cummins. Why use ARP Diesel Head Stud Kits whenever possible?

When the power output of a high compression diesel engine is increased with performance upgrades such as aftermarket turbos, injectors or performance diesel engine tuners the OEM (original equipment manufacturer) head bolts will stretch and fail. When the OEM head bolts stretch you will have to endure the costly, time-consuming job of replacing your head gaskets. ARP has eliminated this costly repair of replacing blown head gaskets by producing the highest quality and strongest high-strength head studs, which have several design advantages over the OEM-specification head studs, including:

  • More accurate torque readings
  • All clamping forces are on one axis
  • Easier engine assembly
  • Manufactured to exacting tolerances
  • Black Oxide finish for increased durability

As a result, more accurate torque readings are possible because these ARP diesel performance head studs don’t twist into the block. All clamping forces are on one axis, creating less force exerted on the block threads, which contributes to improved block life (a very important issue on aluminum blocks). Finally, the proper alignment of caps allows for easier engine assembly each time.

ARP Diesel Head Stud Kits are available for the following trucks:

ARP Diesel Head Stud Kits for Dodge Cummins, Ford Powerstroke, and Chevy / GMC Duramax Diesel Trucks

The high quality of materials, design, and manufacture that Gary brought to their creation has been applied to all of ARP's successive diesel performance product lines. ARP now manufactures all of their ARP fasteners in their ISO 9001 and AS9100 production facilities located in Southern California. These ISO (International Standards Organization) registrations represent their unwavering dedication to producing the highest quality fasteners to insure the proper fit and deliver customer satisfaction with every ARP diesel performance fastener.

With ARP products, you know you are getting the original - and the best American-made fastener on the market today!

Make KLM Performance your provider of choice for all ARP power diesel products.

ARP Is Official Head Bolt of the NADM (National Association of Diesel Motorsports) and the NHDRA (National Hot Rod Diesel Association).

ARP Diesel Head Stud Kits for Dodge Cummins, Ford Powerstroke, and Chevy / GMC Duramax Diesel TrucksKLM Performance carries the full line of ARP Diesel Head Stud Kits for Ford Powerstroke, Chevy/GMC Duramax and Dodge Cummins powered trucks. As an owner of a turbo diesel powered truck you have come to know the ture power potential and OEM designed short comings of your vehicle. More and more KLM Performance customers are increaseing the power levels of there turbo diesel engines. When the power level of your diesel engine is increased with the installation of an aftermarket turbo or twins your boost pressures easily exceed 40 psi which leads to head gasket failure. Increased pressure causes the stock head bolts on your light duty diesel trucks to stretch which can lead to head gasket failure.  ARP Diesel Headstud kits address this weak OEM Head to block sealing is critical and thats where ARP Diesel Head Studs come in. ARP uses premium grade alloys to construct high performance diesel head studs. ARP Diesel Head Studs are offered in several premium grade alloys for application specific tensile strength ratings between 160,000 - 280,000 psi.

Here is a listing of the material specificationsARP Diesel Head Stud Kits for Dodge Cummins, Ford Powerstroke, and Chevy / GMC Duramax Diesel Trucks associated with the ARP production
of Diesel Head Studs:

8740 CHROME MOLY: Until the development of today's modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only moderate strength, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi.

ARP2000®: ARP2000 is an alloy steel that can be safely heat treated to a higher level, producing a greater strength material than 8740. While 8740 and ARP2000 share similar characteristics – ARP2000 is capable of achieving a clamp load at 220,000 psi. ARP2000 is used widely in short track and drag racing as an up-grade from 8740 chrome moly in both steel and aluminum rods. Stress corrosion and hydrogen embrittlement are typically not a problem, providing care is taken during installation.

Cummins Head Studs  /  Duramax Head Studs  /  Powerstroke Head StudsCUSTOM AGE 625 PLUS® is a newly formulated super-alloy that demonstrates superior fatigue cycle life, tensile strength and toughness. ARP Custom Age 625 also offers complete resistance to atmospheric corrosion and oxidation. ARP was the the first to develop manufacturing and testing processes for fasteners manufactured with Custom Age 625+. One of the best features of the Custom Age 625 is that it is a less expensive super alloy and is the material of choice in the 260,000 to 280,000 psi tensile strength range.

Cummins Head Studs  /  Duramax Head Studs  /  Powerstroke Head Studs


ARP Diesel Head Stud Kits for Ford Powerstroke, Dodge Cummins, and Chevy / GMC Duramax Diesel Trucks