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ARP 155-3603 High Performance Cylinder Head Bolt Kit 8740 Chrome Moly

Manufacturer

ARP

<h3>The Gold Standard in Performance Fasteners</h3> <p>When racing enthusiast Gary Holzapfel recognized that fastener failure was causing many engine breakdowns in 1968, he founded Automotive Racing Products (ARP) to solve a critical problem in motorsports. Drawing on his aerospace fastener manufacturing experience, Holzapfel created a company that would revolutionize the performance fastener industry. Today, ARP stands as the world's premier manufacturer of high-strength bolts, studs, nuts, and specialized hardware for racing and high-performance applications.</p> <p>ARP controls all aspects of the manufacturing process in-house, with all operations closely monitored, enabling the company to maintain its reputation for zero-defect quality. Every fastener undergoes forging, heat treatment, thread rolling, and precision finishing at ARP's Southern California facilities, which span over 115,000 square feet. This vertically integrated approach ensures that each component meets exacting standards for strength, fatigue resistance, and reliability under extreme conditions.</p> <h3>Engineered for Championship Performance</h3> <p>ARP's customer roster reads like a who's who of professional motorsports. The product line ranges from quality high-performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications. The company's fasteners have secured victories in virtually every major racing championship worldwide, from Top Fuel dragsters to Formula One cars, proving their worth under the most demanding conditions imaginable.</p> <p>The brand's <a href="/48-arp-engine-cylinder-head-bolt-set-10306">engine cylinder head bolt sets</a> represent the cornerstone of ARP's catalog, offering engine builders the clamping force and reliability needed to prevent head gasket failure in high-boost and high-compression applications. These precision-engineered fasteners utilize proprietary materials and heat treatments that deliver up to ten times the fatigue strength of conventional bolts, making them essential for any serious performance build.</p> <p>For engine internals, ARP manufactures <a href="/48-arp-engine-connecting-rod-5276">connecting rods</a> designed to withstand extreme cylinder pressures and high RPM loads. Each rod is manufactured to aerospace standards with tight tolerances and superior material properties. Whether you're building a street performance engine or a full competition powerplant, ARP connecting rods provide the strength and consistency that professional engine builders demand.</p> <h3>Complete Fastener Solutions</h3> <p>Beyond engine components, ARP's product range extends throughout the entire vehicle. The company's <a href="/48-arp-wheel-lug-stud-7680">wheel lug studs</a> offer critical safety and performance benefits for racing and high-performance street applications, providing greater clamping force and durability than factory studs. ARP's product line contains thousands of part numbers and has expanded to include virtually every fastener found in an engine and driveline.</p> <p>Individual <a href="/48-arp-engine-cylinder-head-bolt-5308">engine cylinder head bolts</a> are also available for custom applications or specific replacement needs, manufactured to the same exacting standards as complete sets. This flexibility allows builders to source exactly what they need for specialized builds or repairs without compromising on quality.</p> <p>What sets ARP apart is not just the breadth of their catalog, but their willingness to develop custom solutions for unique applications. The company maintains complete R&D capabilities, including metallurgical research, product design, prototype machining, and extensive laboratory testing. This engineering expertise ensures that whether you're installing a simple head stud kit or building a record-setting race engine, ARP fasteners deliver the reliability and performance that professionals trust.</p>

Part Number

155-3603
07/13/2036 7:45 AM
Sale Price

$168.01

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The ARP 155-3603 High Performance Series cylinder head bolt kit delivers professional-grade fastening strength for demanding engine applications. Manufactured from premium 8740 chrome moly steel and heat-treated to 180,000 psi tensile strength?15% stronger than Grade 8 fasteners?these head bolts provide superior clamping force and durability for high-performance and racing engines.

Key Features:

  • Premium 8740 chrome moly steel construction for exceptional strength and fatigue resistance
  • Heat-treated to 180,000 psi tensile strength, exceeding Grade 8 specifications
  • Hex head design with wide area flange eliminates need for valve train removal during retorquing
  • Includes hardened parallel-ground washers for even load distribution and accurate torque readings
  • Thread rolled after heat treatment for superior fatigue life and thread integrity
  • Precision manufactured to exacting tolerances for perfect cylinder head alignment

Manufacturing Excellence:

ARP's advanced manufacturing process ensures each fastener meets the highest quality standards. Head bolts are cold-forged to maintain molecular integrity, vertically rack heat-treated for complete penetration, and precisely machined to ensure concentricity. The thread rolling process occurs after heat treatment?a costly but critical step that provides approximately ten times better fatigue strength compared to pre-heat-treat threading methods used by other manufacturers.

Installation Notes:

The flanged hex head design allows for convenient cylinder head retorquing without removing valve train components, making maintenance faster and easier. Because head gaskets compress during initial torquing, always re-torque fasteners after the engine has been run to ensure optimal clamping force and seal integrity.

This kit is designed for engine builders who demand zero-defect reliability and maximum performance from their fastening systems. Each component is manufactured to ARP's exacting standards, ensuring proper gasket compression, consistent clamping force, and long-term durability in high-stress applications.

Products specifications

Cut to Fit

No

Fastener Finish

Black oxide

Fastener Material

Chromemoly

Fastener Style

Bolt

Head Style

Hex

Quantity

Sold as a kit.

Washers Included

Yes

product was as described and arrived ahead of estimated delivery date

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