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ARP 134-7121 High Performance Rocker Arm Studs 8740 Chrome Moly 2-Piece

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

134-7121
07/13/2036 10:57 AM
Sale Price

$9.20

In Stock (10+)

delivery box

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

ARP High Performance Series rocker arm studs are precision-engineered to ensure consistent rocker geometry and reliable performance. Manufactured from 8740 chrome moly forgings and heat-treated to 180,000 psi tensile strength, these studs are designed for E.T. bracket racing, limited rule oval track competition, and high-performance street applications.

Key Features:

  • Concentric within .005" T.I.R. (Total Indicated Runout) from thread pitch to thread pitch for straight, true installation
  • Exact lengths designed to provide positive seating every time
  • Extra-large radius base offers greater resistance to flex under high loads
  • Tip ground flush for optimum adjuster seating
  • 8740 chrome moly construction heat-treated to 180,000 psi
  • Set includes 2 studs

Installation Notes:

  • Not compatible with OEM-style self-locking nuts?must be used with ARP's patented Perma-Loc adjusters
  • Verify optimum rocker arm stud length for your specific application, especially when using longer-than-stock pushrods and valves
  • May require raising the installed height of the rocker arm to compensate for extended length components

ARP rocker studs eliminate the wobble and inconsistency often experienced with standard studs, ensuring precise rocker geometry and dependable valve train operation across all cylinders.

Products specifications

Adjuster Thread Depth

0.8

Base Dia/Thread

7/16-14

Base Thread Length (in)

0.700 in.

Base Thread Size

7/16-14 in.

Effective Stud Length (in)

1.750 in.

Guideplate Locator Shank

Yes

Quantity

Sold as a pair.

Rocker Arm Nut Thread Length (in)

0.800 in.

Rocker Arm Nut Thread Size

3/8-24 in.

Screw-In Thread Depth

0.7

Shank Dia/Thread

3/8-24

Stud Height

1.75

Great price

best price and swift delivery.

Thank you, easy!!

Hope they fit my FLD 120,I have two trucks

Fast shipping and the product met all of my expectations.

Felt like I got the best pricing on this product A+

as described

I'm not going to comment on a part until I've got it installed and road tested. Delivery is too soon for this survey. You should wait a week before sending.

first time so far so good

Not only was our item cheaper, it arrived quickly. Will def. purchase from Autoplicity again! Thanks!

Great price for the item. Both internet and phone conversations were quick and knowledgeable.

Not only did they have an great price on my part, and reasonable shipping charges, they shipped it right away.<br>I know I will be checking them for future parts.

Product received as described. Fast shipping! I will definitely purchase from Autoplicity again.

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Prices were good and the order shipped promptly. The email notice of shipment was a little late. It came after the order had arrived.

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