Header Bolt Kit - 12pt. 3/8 x .875 UHL (16)

The Header Bolt Kit - 12pt. 3/8 x .875 UHL (16) by ARP is designed for serious engine builders and performance enthusiasts who require reliable fasteners for securing exhaust headers to the cylinder head. This kit is particularly beneficial for turbocharged, supercharged, and naturally aspirated high-output builds where header separation and exhaust leaks can be critical issues.

Manufactured from premium alloy steel, these fasteners feature 12-point heads that provide superior grip and reduce the risk of cam-out during installation. The 3/8-inch diameter and .875-inch under-head length (UHL) specification ensure compatibility with OEM and popular aftermarket header designs, delivering consistent preload without thread stripping.

This 16-piece kit is ideal for V8 and inline engines, ensuring matching hardware throughout the assembly. ARP's proprietary heat-treatment process enhances the tensile strength of these bolts, making them suitable for high-performance applications where maintaining seal integrity is essential.