ARP Crankcase Thru Bolt Kit

Multiple Porsche Fitments (204-5407)

Part #: 204-5407

Overview

The ARP Crankcase Thru Bolt Kit is a high-quality fastening solution designed for Porsche engines, specifically tailored for 2.0L and 2.7L models. Engine builders and performance enthusiasts who demand durability and reliability will appreciate the precision engineering and superior materials used in this kit. Whether you're rebuilding your engine for street performance, track days, or high-stress applications, this bolt kit provides the strength and consistency needed to ensure your engine's integrity under demanding conditions.

Constructed with professional-grade materials, the ARP Crankcase Thru Bolt Kit helps secure critical engine components, reducing the risk of bolt failure and ensuring proper clamping force during operation. Its robust design supports increased engine reliability, making it an excellent choice for both stock rebuilds and performance upgrades.

Key Features

The ARP Crankcase Thru Bolt Kit offers several advanced features that set it apart from standard fasteners:

• Manufactured from forged 8740 chrome moly steel, providing exceptional strength and fatigue resistance for demanding engine environments.
• All bolts feature rolled threads after heat treatment, which significantly enhances fatigue strength—up to 2000% better than traditional threaded bolts—ensuring long-lasting performance under high stress.
• Designed with a reduced wrenching head and large underhead radius, facilitating easier installation and removal while maintaining optimal clamping force.
• Precisely engineered for Porsche 2.0L and 2.7L engines, ensuring perfect fitment and compatibility with factory and performance builds.
• Rolled threads and heat treatment processes contribute to superior durability, reducing the likelihood of bolt stretch or failure during high-performance operation.
• Engineered to meet or exceed OEM standards, providing confidence in both street and racing applications.
• Ideal for professional engine builders, racers, and enthusiasts seeking reliable, high-strength fasteners for critical engine assembly points.

Construction & Design

The ARP Crankcase Thru Bolt Kit is meticulously crafted from forged 8740 chrome moly steel, a material renowned for its exceptional toughness and fatigue resistance. The bolts undergo a specialized heat-treating process that enhances their strength and durability, making them suitable for high-stress engine environments. The rolled threads are formed after heat treatment, which aligns the grain structure for maximum fatigue life, providing a significant advantage over conventional threaded bolts.

The design features a reduced wrenching head for easier installation in tight engine bays and a large underhead radius that distributes clamping loads evenly across the crankcase, reducing stress concentrations. These design choices ensure a secure fit and help maintain proper engine sealing under various operating conditions. The kit's precision manufacturing guarantees consistent quality and fitment, making it a reliable upgrade for your Porsche engine rebuild or performance enhancement project.

Performance & Reliability

While this bolt kit is not explicitly rated with horsepower or torque gains, its high-grade construction and engineering significantly improve engine reliability and integrity. By replacing factory fasteners with ARP's proven hardware, you reduce the risk of bolt failure, which can lead to costly engine damage. The rolled threads and heat-treated steel ensure that these bolts maintain their clamping force over time, even under the intense conditions of spirited driving or racing.

Installation & Fitment

The ARP Crankcase Thru Bolt Kit is designed as a direct bolt-on replacement for specific Porsche 2.0L and 2.7L engines. Installation is straightforward for experienced mechanics or enthusiasts familiar with engine assembly. The kit includes all necessary bolts for securing the crankcase components, and no special tools or modifications are required. Proper torque specifications should be followed to ensure optimal clamping force and engine integrity. Always refer to the manufacturer's torque sequence and values for your specific Porsche model.

• Designed for professional engine builders and DIY enthusiasts with basic mechanical skills.
• No cutting, drilling, or additional modifications are necessary for installation.

What's Included

• Complete set of high-strength crankcase bolts tailored for Porsche 2.0L & 2.7L engines
• All necessary hardware for secure fastening
• Installation instructions (if provided by ARP)

Ideal For

• Engine rebuilds for Porsche 2.0L and 2.7L models
• Performance upgrades requiring high-strength fasteners
• Professional engine builders and racing teams seeking reliable hardware
• Enthusiasts aiming to enhance engine durability and longevity

Emissions Note

This product is designed for off-road, racing, or performance use only and may not be legal for street use in all jurisdictions. Please check local regulations before installation.