ARP Main Stud Kits

Universal Fitment

Part #: 154-5503

Overview

The ARP Main Stud Kit is a high-strength fastening solution designed for engine builders seeking enhanced durability and reliability. Crafted from premium 8740 chromoly steel and heat-treated to achieve a tensile strength of 190,000 psi, these studs provide superior strength compared to standard fasteners. They are engineered to help eliminate main cap walk and fretting, ensuring consistent engine performance under demanding conditions. Ideal for performance enthusiasts and professional engine builders, this kit offers peace of mind during high-stress applications by maintaining proper main cap alignment and preventing thread damage in your engine block.

Key Features

This kit features precision-engineered components designed for maximum strength and durability:

• Made from heat-treated 8740 chromoly steel for exceptional tensile strength
• Rolled J-form threads after heat treatment for stronger, more reliable threads
• Includes hardened, parallel-ground washers for precise load distribution
• High-quality nuts designed for secure fastening and long-term reliability
• Engineered to prevent main cap walk and fretting during high-performance use
• Complete kit for easy installation and consistent engine assembly

Construction & Design

The ARP main studs are manufactured from 8740 chromoly steel, a material renowned for its strength and toughness. The studs undergo in-house heat treatment to achieve a tensile rating of 190,000 psi, ensuring they withstand the rigors of high-performance engine operation. The threads are rolled after heat treatment, creating a stronger thread form that resists stripping and fatigue. The inclusion of hardened, parallel-ground washers ensures even load distribution, reducing stress concentrations and enhancing overall assembly integrity.

Installation & Fitment

Proper installation requires verifying fitment against your specific engine model and part number. The kit is designed for multiple Ford applications, but fitment details should be confirmed with your engine specifications and the provided part number. Installation involves replacing existing main cap fasteners with these high-strength studs, ensuring proper torque and alignment for optimal performance.

What’s Included

The kit includes all necessary components for a complete upgrade:

• High-strength main studs
• Hardened parallel-ground washers
• High-quality nuts