ARP Main Stud Kits

Universal Fitment

Part #: 156-5901

Overview

The ARP Main Stud Kit is a high-strength fastening solution designed for engine builders and performance enthusiasts seeking enhanced durability and reliability in their engine assemblies. Crafted from premium 8740 chromoly steel and heat-treated to achieve a tensile strength rating of 190,000 psi, these studs provide superior strength compared to standard fasteners. The kit is ideal for applications where main cap stability is critical, helping to prevent main cap walk and fretting that can compromise engine integrity. Whether you're building a high-performance street engine or a race-ready powerplant, these studs help ensure your engine maintains proper alignment and withstands the rigors of demanding driving conditions. The inclusion of precision rolled J-form threads and hardened parallel-ground washers and nuts ensures a secure, long-lasting fit that supports your engine’s performance and longevity.

Key Features

Designed for strength and reliability, the ARP Main Stud Kit features high-quality materials and precision manufacturing to support your engine build. Key features include:

• Made from 8740 chromoly steel for exceptional strength and durability
• Heat-treated in-house to a 190,000 psi tensile-strength rating
• Precision rolled J-form threads for increased thread strength and integrity
• Hardened, parallel-ground washers and high-quality nuts for secure fastening
• Engineered to eliminate main cap walk and fretting
• Suitable for a variety of Ford engine applications
• Complete kit for easy installation and reliable performance

Construction & Design

The studs are machined from high-grade chromoly steel, known for its excellent strength-to-weight ratio and resistance to fatigue. The heat-treatment process enhances the tensile strength, ensuring the studs can withstand the stresses of high-performance operation. The J-form threads are rolled after heat treatment, providing stronger, more durable threads that resist stripping and wear over time. The included washers and nuts are hardened and ground to precise specifications, ensuring a secure fit and optimal load distribution across the main caps.

Installation & Fitment

Installation of these main studs requires proper torque specifications and attention to detail to ensure optimal performance. Fitment should be verified against your specific engine model and the part number provided. These studs are designed as a direct replacement for the factory main studs in compatible Ford engines, offering a straightforward upgrade for engine rebuilds and performance modifications.

What’s Included

The kit includes all necessary studs, hardened washers, and nuts required for a complete installation, providing everything needed to upgrade your engine’s main cap fasteners with confidence.

Ideal For

This product is ideal for engine builders, performance enthusiasts, and racers looking to reinforce their engine block’s main caps for increased strength, durability, and peace of mind during high-stress driving conditions.