Header Bolt Kit - 6pt. 3/8 x 1.00 UHL (16)

The Header Bolt Kit - 6pt. 3/8 x 1.00 UHL (16) by ARP is engineered for serious engine builders and performance enthusiasts who demand reliability under extreme thermal and mechanical stress. Exhaust header bolts are subjected to constant heating cycles, vibration, and expansion that can cause standard fasteners to loosen or fail, leading to exhaust leaks and potential gasket damage. ARP's premium header bolt kit eliminates these risks by providing specially designed fasteners that maintain clamp load integrity across your entire header assembly, ensuring a sealed connection that lasts.

This kit features 6-point socket head design with 3/8-inch diameter and 1.00-inch UHL (under hex length) specifications, delivering superior grip and torque transfer compared to conventional 12-point heads. ARP fasteners are manufactured from premium alloy steel and shot-peened to enhance fatigue resistance—critical when headers experience repeated thermal cycling from ambient to 1200°F+ exhaust gas temperatures. The 6-point geometry distributes load more evenly across the bolt head, reducing rounding risk during installation and removal, while the precise 1.00-inch length ensures correct engagement depth in your header flange without bottoming out or leaving excessive thread exposure.

Street and track builders choose ARP header bolts for naturally aspirated, forced-induction, and high-heat applications where standard fasteners compromise reliability. The 16-piece set covers most common V8 and inline engine headers, providing enough fasteners for complete header replacement or rebuild scenarios. Whether you're performing a top-end refresh, installing an aftermarket header, or restoring an engine to factory spec, these bolts demand proper installation with ARP's recommended torque specs and assembly lube to achieve maximum preload and service life. Compatible with all ARP header applications requiring 3/8 x 1.00 UHL specifications.