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ARP 230-4201 Cylinder Head Stud Kit 8740 Chrome Moly 12-Point

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

230-4201
05/31/2036 8:00 PM
Sale Price

$671.42

In Stock (10+)

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Usually delivered within 2 days

free shipping

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No Hassle Returns

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Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The ARP 230-4201 Pro Series head stud kit represents the gold standard in cylinder head fastening systems for high-performance and racing engines. Engineered for maximum strength and reliability, these studs deliver consistent clamping force and superior durability under extreme conditions.

Premium 8740 Chrome Moly Construction:

Each stud is manufactured from premium grade 8740 chrome moly steel, rated at 200,000 psi tensile strength?far superior to standard fasteners. ARP employs a vertical rack heat-treatment process that ensures complete and uniform heat penetration throughout each stud, resulting in consistent material properties and exceptional strength.

Precision Manufacturing Process:

  • Centerless ground: Each stud undergoes approximately ten precision grinding passes to achieve near-perfect concentricity, ensuring proper alignment of cylinder heads and gaskets during assembly
  • Post-heat-treat thread rolling: Threads are rolled after heat treatment, providing approximately 1000% better fatigue strength compared to pre-heat-treat threading methods
  • 12-point heads: Provide precise torque application and superior grip
  • Undercut design: Shorter studs feature undercuts to equalize stretch characteristics, creating more consistent clamping force and compensating for head gasket compression

Key Benefits:

  • Superior clamping force accuracy compared to conventional head bolts
  • Easier engine assembly with properly aligned cylinder heads and gaskets
  • Reduced risk of head gasket failure through optimized stud stretch
  • Studs stretch only on the vertical axis during torquing, eliminating torsional stress
  • Ideal for competition engines requiring frequent servicing

Kit Includes:

Complete stud kit with hardened, parallel-ground washers for even load distribution and accurate torque readings. Each stud is stamped with the ARP logo as verification of authenticity and quality.

Installation Note:

Studs should be installed finger-tight in a relaxed mode?never force installation with a jammed nut. After initial torquing and engine break-in, re-torque all fasteners to compensate for head gasket compression.

Trusted by professional engine builders across all forms of motorsports, ARP Pro Series head studs deliver the reliability and performance demanded by serious racers and enthusiasts.

Products specifications

Cut to Fit

No

Fastener Finish

Black oxide

Fastener Material

8740 chromemoly

Fastener Style

Stud

Head Style

12-point

Quantity

Sold as a kit.

Washers Included

Yes

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So far so good. First time ordering from website

Best Price I could find, fast shipping. I shall return!

Lowest prices around the web and excellent customer service. The only real issue was the wait between placing the order and when it was shipped. Took 4 days but I chalk that up to the large amount of business they due to their prices being so competitive. For the lowest prices that I've seen I didn't mind waiting a bit longer!

Very fast shipping and product was secure in package to avoid damage....will be ordering from autoplicity again for sure. Also the price could not be beat.

I ordered my Smittybilt XRC Fender Flares from Autoplicity with skepticism as the price was by far the cheapest I could find. I ordered on a Thursday Night and had them the Following Monday. Very Happy and would purchase from them again. Shipping seemed extremely fair considering the price and weight of the item. Thanks for the prompt service.

Easy as pie!

Fast shipping. And great cust service.

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