ARP Engine Bolt Kit

Why ARP Engine Bolt Kits Are the Gold Standard

When an engine is pushed beyond stock limits — whether on a weekend track day, a drag strip, or a high-boost street build — the weakest link is often a fastener that was never designed for the job. ARP (Automotive Racing Products) has spent decades solving exactly that problem, and their Engine Bolt Kits represent the most trusted fastener solution in performance and racing circles worldwide.

ARP supplies extremely high-strength and fatigue-resistant threaded engine fasteners to NASCAR, IndyCar, NHRA, IMSA, and Formula 1 engine builders and manufacturers. That race-bred pedigree flows directly into every engine bolt kit they produce for enthusiasts and professional builders alike.

Material Tiers: Choosing the Right Alloy for Your Application

One of the defining characteristics of ARP's engine bolt kits is the tiered material selection, allowing builders to match fastener strength to the demands of their specific application. Fastener materials are available in 8740 Chrome Moly, ARP2000, and Custom Age 625+.

• 8740 Chrome Moly: ARP's heat-treated 8740 Chrome Moly steel alloy bolts feature a black oxide finish, offering a reliable, proven solution for high-performance street and mild race builds.
• ARP2000: Made from a special material designated ARP2000, these fasteners have approximately 200% the fatigue life of 8740 chrome moly steel, a tensile strength of 220,000 psi, and are capable of more than 12,000 lbs of clamping force.
• Custom Age 625+: Custom Age 625+ reaches a tensile strength of 280,000 psi, making it the go-to choice for extreme-boost, forced-induction, or all-out competition engines.

What's Inside an ARP Engine Bolt Kit

It's easy to assemble a show-quality engine when you use ARP's Engine & Accessory Fastener Kits — virtually everything you need comes completely organized in one convenient package, eliminating the need to deal with twelve different part numbers. ARP engine bolt kits come in your choice of polished stainless steel or black oxide chromoly steel bolts with 12-point or hex heads.

Each and every fastener is superior in strength to the OEM bolts, and also significantly better than hardware grades — even Grade 8. For builds where corrosion resistance matters, ARP's specially alloyed Stainless 300 material is virtually impervious to rust and corrosion, polished to achieve a brilliant luster and providing a distinctive, maintenance-free environment.

Broad Application Coverage

ARP offers a complete catalog of over 5,500 high-performance kits, and continuously develops new kits for the latest engines and applications. From classic American V8s like Chevy Small Block and Big Block to modern turbocharged platforms like the Ford EcoBoost, GM Duramax, and import engines found in BMW, Porsche, and Toyota powerplants, ARP's engine bolt kit lineup covers an enormous breadth of applications. ARP has channeled decades of knowledge to continuously improve existing fasteners and kits, as well as create new ones for everything from diesel trucks to personal watercraft to the fastest land speed vehicles in the world.

Engineered for Precision Assembly

All high-strength bolts feature rolled rather than cut threads, and the threads are rolled after heat-treatment — a critical detail that maximizes fatigue life and ensures consistent clamp loads. ARP includes a packet of Ultra-Torque lubricant with most kits, which facilitates obtaining 95–100 percent of the desired preload on the first and all subsequent pulls of the torque wrench.

All ARP products are Made in the USA in Southern California, backed by manufacturing facilities that include forging, machining, and finishing operations, as well as one of the industry's most rigorous in-house quality control programs. For any serious engine build, ARP Engine Bolt Kits are the fastener standard that professional builders rely on — and the one that enthusiasts trust to keep their engines together.