ARP Main Bolt Kits

Part #: 204-5001

Overview

The ARP Main Bolt Kit is a high-quality engine fastener solution designed to enhance the durability and reliability of your engine's main cap assembly. Crafted for performance enthusiasts and professional builders, this kit helps prevent main cap walk and fretting, ensuring consistent engine integrity under demanding conditions. Made from premium materials, these studs are engineered to withstand extreme stresses, providing peace of mind during high-performance applications or rebuilds. Whether you're restoring a classic Porsche or building a high-powered engine, this kit offers a robust solution to support your engine's longevity and performance.

Key Features

Designed with precision and strength in mind, the ARP Main Bolt Kit features:

• Constructed from 8740 chromoly steel for exceptional strength and durability
• Heat-treated in-house to a 190,000 psi tensile-strength rating for maximum resilience
• Rolled J-form threads after heat treatment to create stronger, more reliable threads than standard fasteners
• Complete with hardened, parallel-ground washers to ensure proper load distribution
• High-quality nuts designed for secure, long-lasting fastening
• Engineered to eliminate main cap walk and fretting, supporting engine stability
• Suitable for multiple Porsche engine applications, ensuring versatile fitment

Construction & Design

The studs are machined from 8740 chromoly steel, a material known for its excellent strength-to-weight ratio and fatigue resistance. The heat-treatment process enhances the tensile strength, making these fasteners capable of withstanding extreme engine loads. The precision rolled threads ensure a tight, secure fit, reducing the risk of thread stripping or failure during high-stress operation.

Installation & Fitment

Installation requires proper torque specifications and should be performed by qualified technicians familiar with Porsche engine assembly. Fitment details should be verified against the specific vehicle model and engine configuration to ensure compatibility.

What’s Included

The kit includes all necessary studs, hardened washers, and nuts to complete the main cap fastening upgrade, providing a comprehensive solution for your engine rebuild or upgrade.

Ideal For

This product is ideal for performance engine builders, Porsche enthusiasts, and anyone seeking to reinforce their engine's main cap assembly for increased strength and reliability during high-performance driving or rebuild projects.