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ARP Hardware & Fasteners

ARP Hardware & Fasteners

ARP Hardware and Fasteners for Aircooled and Watercooled Porsche Engines

ARP is the world leader in automotive fastener technology. ARP products are proudly made in the USA.

ARP started applying technology to race fastener design and manufacturing in 1968 and was the first company to design and engineer fasteners specifically for racing. They developed many patented process for manufacturing high strength fasteners from very strong materials and have continued to improve their processes and quality control with manufacturing operations that are ISO 9001 and AS9100 registered. These registrations represent ARP's unwavering dedication to producing quality fasteners, continually improving our quality management system and delivering total customer satisfaction. There is no another company in the world that is as focused on building superior quality fasteners for all forms of racing and non-racing applications as Automotive Racing Products.

LN Engineering recommends ARP fasteners and its Nickies Cylinders were developed for and tested with ARP Head Studs in the ARP 2000 and Custom Age 625 alloy. ARP manufactures fasteners from a wide assortment of materials ranging from popular stainless steel and 8740 chrome moly to exotic alloys to meet the application requirements for each fastener.

The ARP2000 material used to make ARP head studs, case bolts, and connecting rod bolts is about 33% stronger than the stock material, with a 220,000psi tensile strength and improved fatigue characteristics. Our Porsche 356 and 912 ARP head studs are available exclusively through LN Engineering utilize the ARP2000 material. The ARP Porsche 911 head studs have a 265,000+ psi tensile strength and use ARP Custom Age 625+. All ARP studs have been designed and tested for use with Nickies™ Cylinders!

The reason for offering replacement studs stems from the fact that our testing found that no available head stud was compatible with our Nickies™ or any aluminum cylinders for that matter, with exception of the 911 models equipped with aluminum cylinders from the factory. In most cases, the factory head studs are unable to perform satisfactorily under the increased expansion of an aluminum cylinder, in most cases leading to head leaks and fastener fatigue.

On 911 models, certain engines came fitted with Dilivar head studs, which were designed to match the expansion of the cylinders, but also suffered from hydrogen embrittlement, which is a condition that results from the accumulation of hydrogen gas in the atomic structure of the metal. This gas flows to the point of high stress (stress risers) and causes microscopic cracks. The hydrogen then flows to the “new” crack tip and causes it to crack further. In this way the crack moves across the part, because the crack-tip IS the stress riser. Finally the crack gets so large that the section is not large enough to support the load. Hydrogen embrittlement can take place without tensile stress. ARP® employs a baking process that purges hydrogen gas from the steel, eliminating this problem.

ARP's head studs are proven and tested for a lifetime of reliability and performance and are required for use with Nickies cylinders. (ARP or equivalent upgraded head studs can be used where OE head studs are not compatible or recommended).

For best results, follow the instructions provided with your new ARP fasteners, as they may differ from factory specifications or installation procedures and proper installation is critical for any fastener. ARP offers a detailed Fastener Installation Overview that goes over the difference between the three generally accepted methods employed to determine how much tension is exerted on a fastener.

For applications where ARP fasteners are not available or desired, we stock and recommend Raceware fasteners.

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