ARP 234-6421 Cylinder Head Fasteners

ARP 234-6421 cylinder head fasteners deliver the legendary strength and reliability that engine builders demand for high-performance applications. Manufactured from premium materials and precision-engineered to exacting specifications, these fasteners provide superior clamping force and durability under extreme cylinder pressures and temperatures.

Key Features:

• Forged in-house at ARP using only the finest quality materials for consistent strength
• Heat-treated using special vertical racks to ensure complete 360-degree penetration
• Threads rolled after heat-treat to provide up to 10-times longer fatigue strength
• Precision CNC-machined to exacting specifications for proper fit and function
• Specially designed for optimum reliability and performance in demanding applications
• Superior fatigue resistance compared to OEM and competitor fasteners

ARP fasteners are the choice of professional engine builders and racers worldwide. Each fastener is proudly stamped with the ARP name as your assurance of quality and performance. Whether you're building a street performance engine or a full-competition race motor, ARP cylinder head fasteners provide the clamping force and reliability you need to keep your engine sealed and running strong.

Installation Note: Always follow ARP's installation instructions and use the recommended ARP Ultra-Torque fastener assembly lubricant for accurate torque readings and optimal performance.