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ARP 208-4308 Head Stud Kit High Performance 8740 Chrome Moly 12-Point

Manufacturer

ARP

<h3>About ARP – Automotive Racing Products</h3><p>Few names carry as much weight in the performance fastener world as <strong>ARP</strong> — short for Automotive Racing Products. Back in 1968, racing enthusiast Gary Holzapfel noticed that many of his friends' broken engines were caused by fastener failure, and at the time no commercially available studs or bolts were up to the challenge — so he drew on his years of experience as a leading aerospace subcontractor and founded ARP. That problem-solving spirit has driven the company ever since.</p><p>From a backyard garage workshop, ARP has grown into a highly diversified manufacturer with 18 buildings across Southern California, totaling more than 275,000 square feet of forging, heat-treating, machining, quality control, finishing, and packaging facilities in Santa Paula and Ventura, California.</p><h3>Engineering That Goes Beyond &quot;Aerospace Quality&quot;</h3><p>ARP uses only top-quality materials — far above the usual &quot;aerospace quality&quot; others settle for — in a highly exacting manufacturing process to create fasteners with the strength and durability to last race after race. Fastener materials are available in 8740 Chrome Moly, ARP2000, and Custom Age 625+, each engineered for specific performance thresholds. In order to ensure optimum quality control, ARP controls all aspects of the manufacturing process entirely in-house — a discipline that has allowed it to build a reputation for &quot;zero defects&quot; quality throughout the industry.</p><p>Automotive Racing Products has achieved ISO 9001:2008 and AS9100 registration, certifications the company has maintained as a testament to its unwavering dedication to producing the highest quality fasteners available. ARP also operates an Aerospace Division and is one of the very few companies in the world fully licensed by the United States Government to manufacture MS-21250 fatigue-rated fasteners.</p><h3>Trusted by the World&apos;s Top Racing Programs</h3><p>ARP enjoys working relationships with professional engine builders and race teams across Formula 1, IndyCar, IMSA, NASCAR, NHRA, IHRA, Lucas Oil Late Model Dirt, and World of Outlaws — constant interaction that keeps ARP on the cutting edge of fastener technology. Whether you&apos;re building a weekend bracket racer or a full-time professional race engine, ARP has a solution engineered to hold things together under the most extreme conditions.</p><h3>ARP&apos;s Engine Fastener Lineup</h3><p>Today, ARP&apos;s product line contains thousands of part numbers and has expanded to include virtually every fastener found in an engine and driveline and throughout the suspension and frame. Among the most popular are <a href="/48-arp-engine-cylinder-head-bolt-set-10306">Engine Cylinder Head Bolt Sets</a>, <a href="/48-arp-engine-connecting-rod-bolt-5280">Engine Connecting Rod Bolts</a>, and complete <a href="/48-arp-engine-connecting-rod-5276">Engine Connecting Rods</a> — three categories that represent the critical fastening points where engine integrity is made or lost. ARP&apos;s High Performance series head bolt kits are rated at 170,000 psi — 15 percent stronger than Grade 8 fasteners — and are available with hex heads or reduced-wrenching 12-point heads that eliminate the need for valvetrain removal when re-torquing.</p><p>ARP stands behind its products indefinitely with respect to materials and workmanship, making every fastener a long-term investment in engine reliability rather than a consumable component.</p>

Part Number

208-4308
09/12/2036 5:27 AM
Sale Price

$206.93

In Stock (10)

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Usually delivered within 2 days

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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 208-4308 is a high-performance head bolt kit featuring premium 8740 chrome moly steel construction with 12-point heads. Designed for serious performance applications, this kit delivers the exceptional strength and reliability that professional engine builders demand.

Premium 8740 Alloy Construction:

ARP manufactures these fasteners from premium grade 8740 chrome moly alloy rated at 200,000 psi—far superior to aircraft quality materials. Each component is vertically rack heat-treated to ensure complete and uniform heat penetration, resulting in consistent strength throughout every fastener.

Precision Manufacturing Process:

  • Centerless ground for exceptional concentricity and straightness
  • Thread rolled after heat treatment for 10x better fatigue strength
  • Cold-forged to ensure molecular integrity
  • 12-point head design with wide-area flange for easy retorquing
  • Reduced wrenching hex eliminates need for valve train removal
  • Includes hardened parallel-ground washers for even load distribution

Engineering Advantages:

The precision manufacturing ensures that cylinder heads and gaskets align perfectly during installation. The 12-point head with wide-area flange allows for cylinder head retorquing without removing valve train components, making maintenance faster and easier. Select applications feature undercut short bolts that provide more uniform stretch to compensate for head gasket compression, helping prevent blown gaskets and ensuring optimal engine sealing.

Installation Notes:

These fasteners provide more accurate and consistent torque loading compared to standard bolts. The kit includes hardened parallel-ground washers to ensure even load distribution and accurate torque readings. Always re-torque after initial engine operation to compensate for head gasket compression.

Trusted by leading professional engine builders across all forms of motorsports, ARP fasteners represent the gold standard in engine assembly hardware. Each component is stamped with the ARP logo as your assurance of quality and meets ARP's zero-defect, zero-failure quality standard.

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it was ok

Perfect fit, like the original. Im very pleased, thank you.

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A+ so far.

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all good so far

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