ARP Pro Series Cylinder Head Stud Kits

1990–2005 Mazda Miata 1.6L & 1.8L

Part #: 218-4701

Overview

The ARP Pro Series Cylinder Head Stud Kits are engineered to provide superior clamping force and durability for Mazda Miata models from 1990 to 2005. Designed specifically for enthusiasts who seek reliable head gasket sealing under high-performance conditions, these studs are ideal for turbocharged builds, forced induction, or any application demanding increased strength and precision. Whether you're rebuilding your engine or upgrading for enhanced performance, ARP's Pro Series studs ensure your cylinder head remains securely in place, even under extreme stress.

Constructed with high-quality materials and precision manufacturing, these head studs help support increased horsepower and torque, providing peace of mind during spirited driving or racing. Their robust design minimizes the risk of head gasket failure, ensuring consistent compression and optimal engine performance. If you're looking for a reliable upgrade that combines strength, accuracy, and longevity, the ARP Pro Series Cylinder Head Stud Kits are an excellent choice.

Key Features

The ARP Pro Series Cylinder Head Stud Kits incorporate advanced materials and manufacturing processes to deliver unmatched strength and reliability. Key features include:

• Material: Made from 8740 chromoly steel, these studs are heat-treated to a tensile strength of 220,000 psi, providing exceptional durability and resistance to stretching or failure under high loads.
• Design: The studs feature a cold-forged process that ensures molecular integrity, resulting in a consistent and reliable product. The 12-point head style allows for easier installation and removal in tight engine bays.
• Load Distribution: All kits come complete with hardened parallel washers that distribute load evenly across the cylinder head, promoting accurate torque readings and preventing warping or uneven stress.
• Thread Rolling & Machining: The threads are thread-rolled prior to machining, enhancing fatigue strength and ensuring a secure, precise fit.
• Compatibility: Specifically designed for Mazda Miata engines from 1990 to 2005, including both 1.6L and 1.8L variants.
• Complete Kit: All necessary components, including studs, washers, and nuts (if specified), are included for a straightforward installation process.

Construction & Design

The ARP Pro Series Cylinder Head Studs are manufactured using a cold-forging process that aligns the grain structure of the steel, resulting in a stronger, more resilient fastener. The 8740 chromoly steel material is carefully heat-treated to achieve a tensile strength of 220,000 psi, ensuring these studs can withstand the rigors of high-performance applications. The 12-point head design provides increased engagement with tools, facilitating installation and removal in confined engine compartments.

Each stud features precision thread rolling, which enhances fatigue strength and ensures a secure fit with the included hardened washers and nuts. The use of parallel washers helps distribute load evenly across the cylinder head surface, preventing warping and maintaining proper sealing pressure. These design choices make the ARP Pro Series studs a reliable upgrade for both stock and modified engines, supporting consistent performance and longevity.

Performance & Reliability

While these studs are not rated for specific horsepower gains, their high tensile strength and superior construction significantly improve the engine's ability to maintain proper head gasket sealing under increased boost or compression. They help support increased horsepower and torque, making them ideal for turbocharged or high-compression builds. Their durability ensures long-term reliability, reducing the risk of head gasket failure during demanding driving conditions.

Installation & Fitment

The ARP Pro Series Cylinder Head Stud Kits are designed as a direct bolt-on upgrade for Mazda Miata models from 1990 to 2005. Installation is straightforward for experienced mechanics or enthusiasts familiar with engine assembly. The kit includes all necessary components, and no additional modifications are required. Proper torque specifications should be followed as per ARP's instructions to ensure optimal clamping force and sealing integrity. No cutting, drilling, or special tuning is necessary.

• Ensure the engine is cool and the cylinder head is clean before installation.
• Use ARP's recommended torque sequence and specifications for proper installation.
• Apply ARP Ultra-Torque fastener assembly lubricant to achieve accurate torque readings.

What's Included

• Complete set of ARP Pro Series Cylinder Head Studs (8740 chromoly steel)
• Hardened parallel washers
• High-quality nuts (if specified)
• Installation instructions

Ideal For

• High-performance Mazda Miata owners
• Engine builders seeking reliable head stud upgrades
• Turbocharged or forced induction setups
• Rebuilds and engine modifications requiring increased clamping force

Emissions Note

This product is designed for off-road or racing use only and may not be legal for use on pollution-controlled vehicles in all jurisdictions. Please check local regulations before installation.