ARP Main Stud Kits

Universal Fitment

Part #: 206-5401

Overview

The ARP Main Stud Kit is a high-strength fastening solution designed for engine builders seeking maximum reliability and durability. Crafted from premium 8740 chromoly steel and heat-treated to an impressive 190,000 psi tensile-strength rating, these studs help prevent main cap walk and fretting, ensuring the integrity of your engine block under demanding conditions. Ideal for performance applications, race builds, or any engine where maintaining precise main cap alignment is critical, this kit provides a robust foundation for your engine assembly. The precision J-form threads are rolled after heat treatment, resulting in stronger, more reliable threads compared to standard fasteners. Complete with hardened, parallel-ground washers and high-quality nuts, these studs are engineered to deliver consistent performance and peace of mind during high-stress operation.

Key Features

Designed for strength and durability, the ARP Main Stud Kit features:

• Made from 8740 chromoly steel for exceptional toughness
• Heat-treated in-house to 190,000 psi tensile strength
• Precision rolled J-form threads for enhanced thread strength
• Complete with hardened parallel-ground washers
• High-quality nuts for secure fastening
• Engineered to eliminate main cap walk and fretting
• Suitable for a variety of engine configurations and performance builds

Construction & Design

The studs are machined from 8740 chromoly steel, a material known for its excellent strength-to-weight ratio and durability. The heat-treatment process enhances tensile strength, ensuring the studs can withstand the stresses of high-performance engine operation. The rolled threads provide superior thread integrity, reducing the risk of stripping or failure under load. The included washers are hardened and ground for precise fitment, contributing to the overall reliability of the assembly.

Installation & Fitment

Installation requires proper torque specifications and should be performed following engine assembly best practices. Fitment varies depending on engine model; verify compatibility with your specific application using the part number 206-5401 and consult your engine builder or manufacturer guidelines for proper installation procedures.

What’s Included

The kit includes all necessary components: studs, hardened washers, and nuts, providing everything needed for a complete upgrade to your engine’s main cap fastening system.

Ideal For

This product is ideal for performance enthusiasts, engine builders, and racers looking to strengthen their engine block and improve long-term reliability during high-stress operation.