ARP Rocker Arm Stud Kit 135-7102 Purple 7/16-20 Grade 8.8 Chrome Moly

Description

Product Overview

The ARP 135-7102 Rocker Arm Stud Kit is a precision‑engineered component set designed for high‑performance automotive applications. Constructed from 8740 chrome‑moly alloy steel and heat‑treated to a minimum of 180,000 psi, each stud delivers the strength and durability required for both competitive racing environments and demanding street use. The studs feature a 7/16‑20 UNC thread with a 3A thread class, providing a secure, repeatable connection that resists loosening under extreme loads.

Every stud in this kit is finished with a durable painted coating in a distinctive purple color, making it easy to identify during installation and service. The extra‑large radius base is specifically engineered to reduce flex, offering greater resistance to deformation when subjected to high torque inputs. With a maximum shear strength of 120,000 psi, these fasteners are capable of handling the intense forces generated by modern high‑output engines.

Designed for use with ARP’s patented Perma‑Loc adjusters, the kit ensures a positive seating every time, eliminating the need for additional locking mechanisms. The precise dimensions—1.900 in overall stud height, .750 in screw‑in thread depth, and .750 in adjuster thread depth—provide a consistent fit across a wide range of rocker arm configurations. This level of accuracy is the result of ARP’s strict manufacturing tolerances, which guarantee that each stud runs straight and true out of the box.

In addition to the core performance benefits, the kit includes three high‑quality studs, each weighing approximately 1.89 lb in total, offering a lightweight yet robust solution for performance enthusiasts. The inclusion of a detailed installation guide and ARP’s renowned customer support ensures that even first‑time users can achieve a professional installation with confidence.

Whether you are building a drag car, competing in limited‑rule oval track events, or simply seeking a reliable upgrade for your street vehicle, the ARP 135‑7102 Rocker Arm Stud Kit provides the combination of strength, precision, and durability that performance‑oriented drivers demand.

Usage

This stud kit is ideally suited for a variety of high‑performance applications. In drag racing, the studs’ high shear strength and precise thread engagement help maintain rocker arm stability during rapid acceleration and intense torque spikes. For limited‑rule oval track competition, the extra‑large radius base reduces flex, allowing for more consistent valve timing and improved engine breathing.

Street enthusiasts will also benefit from the kit’s robust construction. The chrome‑moly alloy resists corrosion and wear, making it a reliable choice for daily driving where exposure to moisture and road salts is common. The purple finish not only adds a visual cue for easy identification but also serves as a protective layer against environmental factors.

Installation is straightforward for both professional mechanics and DIY hobbyists. The studs are compatible with ARP Perma‑Loc adjusters, eliminating the need for additional locking nuts. This compatibility streamlines the assembly process, reduces part count, and minimizes the potential for installation errors. The kit’s design ensures that the studs seat positively, providing a secure foundation for the rocker arm and contributing to overall engine reliability.

Why Choose Us

ARP has a long-standing reputation for delivering high‑quality performance fasteners, and this rocker arm stud kit exemplifies that commitment. Each stud undergoes rigorous testing to verify compliance with Grade 8.8 specifications, guaranteeing that you receive a product that meets or exceeds industry standards. The use of 8740 chrome‑moly alloy ensures a balance of strength and toughness, providing resistance to both tensile and shear forces.

Our manufacturing process emphasizes precision. By maintaining tight tolerances, ARP ensures that every stud runs true, reducing the likelihood of misalignment that can lead to premature wear or failure. The heat‑treatment process further enhances the material’s hardness, delivering a component that can withstand the demanding conditions of high‑performance engines.

Customer support is a cornerstone of the ARP experience. Our technical team is available to assist with installation questions, compatibility concerns, and performance advice. In addition, the kit comes with a comprehensive warranty, reflecting our confidence in the product’s durability and performance over the long term.

Key Features

• High‑strength 8740 chrome‑moly alloy provides exceptional durability and resistance to wear.
• Extra‑large radius base reduces flex, ensuring stable rocker arm positioning under high torque.
• Precise 7/16‑20 UNC thread with 3A class delivers a secure, repeatable fit for racing and street use.
• Heat‑treated to 180,000 psi for maximum shear strength and long‑lasting performance.
• Comes with ARP’s dedicated customer support and warranty for peace of mind.

FAQ

What makes the ARP 135‑7102 studs suitable for both racing and street applications?

The studs combine a high‑grade chrome‑moly alloy with a robust heat‑treatment process, delivering the strength needed for racing while the painted finish protects against corrosion for everyday driving.

Can these studs be used with other brands of adjusters?

While the studs are optimized for ARP Perma‑Loc adjusters, they feature standard 7/16‑20 UNC threads, allowing compatibility with many aftermarket adjusters that meet the same specifications.

How does the extra‑large radius base improve performance?

The larger radius distributes load more evenly across the stud, reducing flex and maintaining precise rocker arm geometry, which translates to more consistent valve timing and better engine efficiency.

What is the warranty coverage for this kit?

ARP offers a limited lifetime warranty against material defects for the studs, ensuring that any manufacturing issues are addressed promptly and at no cost to the customer.

Is the purple coating purely cosmetic, or does it serve a functional purpose?

The purple coating provides visual identification for easy installation and also adds a protective layer that helps resist corrosion and wear, extending the service life of the fasteners.