Header Bolt Kit - 12pt. 5/16 x .750 UHL (14)

The ARP Header Bolt Kit – 12pt. 5/16 x .750 UHL (14-piece set) is designed for serious engine builders who require reliable fastening solutions for high-performance exhaust headers. This kit is ideal for both street and competition applications, ensuring that header bolts do not fail under thermal cycling and vibration. Whether you're rebuilding a modified engine or installing performance headers, this kit provides the necessary reliability.

Crafted from ARP's proprietary alloy steel, these header bolts feature 12-point heads that offer superior tensile strength compared to standard fasteners. The 5/16-inch diameter and .750-inch underhead length (UHL) specification ensure proper clamping pressure on flanges without bottoming out. The 12-point design allows for multiple contact points with your socket or wrench, minimizing the risk of rounding during installation.

This 14-piece kit is particularly beneficial for those working on small-block and mid-sized engine header applications, providing a secure fit that prevents exhaust leaks and header movement. ARP's engineering ensures consistent preload retention, making it a reliable choice for both daily drivers and track vehicles. With this kit, you can trust that your header flanges will remain clamped tight throughout the engine's operating life.