Header Bolt Kit - 6pt. 10mm-1.25 x 25mm (16)

The Header Bolt Kit - 6pt. 10mm-1.25 x 25mm (16) from STAGE 8 FASTENERS is engineered for engine builders, mechanics, and powersports enthusiasts who demand reliability under extreme combustion pressures. Header bolts are critical fastening components that secure exhaust manifolds and headers to engine blocks, where temperature fluctuations, vibration, and thermal cycling create constant stress on conventional hardware. This 16-piece kit delivers the precision and durability required in high-performance applications where bolt failure can result in catastrophic exhaust leaks, performance loss, or engine damage.

Each bolt in this kit features a 6-point head design that provides superior grip geometry compared to 12-point alternatives, reducing the risk of rounding and ensuring consistent torque transfer during installation and repeated thermal cycles. The 10mm-1.25 thread pitch with a 25mm length specification accommodates standard engine block configurations across automotive and powersports platforms. STAGE 8 FASTENERS utilizes specialized alloy steel construction and proprietary heat-treatment processes to achieve higher tensile strength and fatigue resistance than OEM hardware, maintaining clamp load integrity even as temperatures swing between ambient and 1000+ degrees Fahrenheit during extended engine operation.

This header bolt kit is ideal for street performance engines, drag racing platforms, marine applications, and off-road vehicles where header temperatures exceed standard cooling parameters. The 16-piece count accommodates most dual-header configurations on V8 and larger displacement engines. Installation requires standard metric socket and torque wrench methodology—proper torque specification per manufacturer guidance ensures optimal clamping force without over-torquing, which can compromise bolt integrity. Compatibility spans most popular engine platforms including LS, big-block Chevrolet, Ford 351C/460, and Mopar engines; verify thread pitch and length against your specific manifold flange configuration before ordering.