ARP Main Bolt Kits

Universal Fitment

Part #: 156-5201

Overview

The ARP Main Bolt Kit is a high-quality engine fastener solution designed to enhance the durability and reliability of your engine assembly. Crafted for performance enthusiasts and professional rebuilders, this kit helps prevent main cap walk and fretting, ensuring consistent alignment and secure fastening under demanding conditions. Made from premium materials, these bolts are engineered to support the integrity of your engine block, providing peace of mind during high-performance driving or heavy-duty applications. Whether you're building a new engine or restoring an existing one, this kit offers the strength and precision needed for a reliable, long-lasting build.

Key Features

This kit features advanced materials and a precision design to deliver superior performance and durability:

• Made from 8740 chromoly steel for exceptional strength and toughness
• Heat-treated in-house to a 190,000 psi tensile-strength rating for maximum durability
• Rolled J-form threads after heat treatment for stronger, more reliable threads
• Includes hardened, parallel-ground washers for consistent load distribution
• High-quality nuts designed for secure fastening and ease of installation
• Engineered to eliminate main cap walk and protect engine threads during high-stress operation

Construction & Design

The ARP main stud kits are constructed from 8740 chromoly steel, a material renowned for its high tensile strength and fatigue resistance. The heat-treatment process enhances the material's properties, ensuring the bolts can withstand extreme engine conditions. The precision rolled threads provide a secure, interference-free fit, reducing the risk of thread stripping and ensuring consistent torque application. The included washers are hardened and ground to exact specifications, supporting even load distribution and minimizing wear over time.

Installation & Fitment

Installation requires proper torque specifications and should be performed following ARP's recommended procedures. Fitment details should be verified against your specific engine model and application to ensure compatibility. These bolts are designed as a direct replacement for various Ford engine applications, but compatibility should be confirmed prior to installation.

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 fasteners for enhanced strength and reliability.

Ideal For

This product is ideal for engine builders, performance enthusiasts, and anyone looking to reinforce their engine's main cap fasteners for high-stress or high-performance applications. It’s suitable for custom builds, rebuilds, and restorations where strength and precision are critical.