ARP 235-6421 Cylinder Head Fasteners - Kit

ARP 235-6421 cylinder head fasteners are precision-engineered to deliver superior clamping force and reliability in high-performance and racing engine applications. These fasteners are manufactured from premium materials and undergo ARP's rigorous quality control processes to ensure consistent performance under extreme loads and temperatures.

Key Features:

• Forged in-house at ARP facilities using aerospace-quality materials
• Heat-treated using specialized vertical racks to ensure complete 360-degree penetration for uniform strength
• Threads rolled after heat-treatment to provide up to 10 times longer fatigue life compared to cut threads
• Precision CNC-machined to exacting tolerances for consistent fit and performance
• Engineered specifically for optimal reliability and clamping force in demanding applications
• Each fastener proudly stamped with the ARP name as assurance of quality

ARP cylinder head fasteners are designed to eliminate the weak points found in OEM hardware. By providing superior material strength, precise manufacturing tolerances, and enhanced fatigue resistance, these fasteners ensure your cylinder heads remain properly sealed and secured even under extreme cylinder pressures and thermal cycling. Whether you're building a high-performance street engine or a competition race motor, ARP fasteners deliver the reliability and peace of mind that professional engine builders demand.