Header Bolt Kit - 12pt. 5/16-18 x 1in (12)

The Header Bolt Kit - 12pt. 5/16-18 x 1in (12) from STAGE 8 FASTENERS is engineered for serious engine builders and performance mechanics who demand reliability under extreme heat and vibration. Header bolts are critical fasteners that secure exhaust manifolds and headers to the engine block, experiencing constant thermal cycling and mechanical stress that standard fasteners simply cannot withstand. This 12-pack kit provides the premium-grade bolts needed to maintain a secure, leak-free seal and prevent costly header leaks that compromise engine efficiency and power output.

STAGE 8's 12-point socket head design offers superior clamping force and load distribution compared to standard 6-point fasteners, reducing the risk of stripping and bolt failure during installation and removal cycles. The 5/16-18 thread specification with 1-inch length fits a broad range of small-block and mid-size engine platforms, while the 12-point configuration allows precise torque application using both standard and metric socket sizes. These bolts are manufactured to withstand continuous temperatures exceeding 1,000°F, critical for header applications where manifold surfaces routinely reach extreme heat levels that degrade inferior fasteners.

This kit is ideal for street performance builds, race engines, and restoration projects where header installation or replacement requires reliable, high-strength fastening solutions. Mechanics upgrading factory manifolds to aftermarket headers, or those rebuilding engines with performance exhaust systems, will appreciate the consistency and durability STAGE 8 delivers across multiple bolt cycles. The 12-piece quantity accommodates most dual-header setups, making this a practical choice for comprehensive exhaust system work on V8 and larger displacement engines.