ARP Main Cap-Side Bolt

Universal Fitment

Part #: 156-5002

Overview

The ARP Main Cap-Side Bolt Kit is a high-quality hardware upgrade designed for performance engine builds. Crafted from premium 8740 chromoly steel and heat-treated to achieve a tensile strength of 190,000 psi, these bolts provide exceptional durability and reliability. They are engineered to help eliminate main cap walk and fretting, ensuring your engine maintains optimal alignment under demanding conditions. This kit is ideal for enthusiasts and professional builders seeking to enhance engine integrity and longevity, especially in high-performance or modified applications. With precision rolled J-form threads and hardened washers, ARP's main cap bolts support a secure, stable fit that contributes to consistent engine operation and peace of mind during intense driving or racing scenarios.

Key Features

Designed for strength and precision, these main cap-side bolts feature:

• Made from high-grade 8740 chromoly steel for superior toughness
• Heat-treated in-house to 190,000 psi tensile strength
• Rolled J-form threads for increased thread strength and durability
• Complete with hardened, parallel-ground washers and high-quality nuts
• Engineered to prevent main cap walk and fretting
• Suitable for a variety of Ford applications

Construction & Design

These ARP main cap bolts are meticulously manufactured from 8740 chromoly steel, a material renowned for its excellent strength-to-weight ratio and fatigue resistance. The heat-treatment process enhances their tensile properties, ensuring they withstand the stresses of high-performance engine operation. The precision J-form threads are rolled after heat treatment, providing stronger, more reliable engagement compared to cut threads. The included washers are hardened and ground to exact specifications, ensuring a perfect fit and optimal load distribution. This combination of robust materials and thoughtful design makes these bolts a dependable choice for demanding engine builds.

Installation & Fitment

Installation requires proper torque specifications and should be performed following manufacturer guidelines to ensure optimal performance. Fitment details should be verified against your specific engine model and application to confirm compatibility.

What’s Included

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

Ideal For

This product is ideal for engine builders, performance enthusiasts, and racers looking to reinforce their engine's main cap assembly, supporting high-stress operation and long-term durability.