Header Bolt Kit - 12pt. 3/8-16 x 1-1/4 (12)

The STAGE 8 FASTENERS Header Bolt Kit – 12pt. 3/8-16 x 1-1/4 (12) is a purpose-built fastening solution designed for high-performance engine builds, particularly GM V6 and small-block Chevy applications. This 12-piece kit features premium nickel-plated steel construction with 12-point heads and integral locking design, delivering the critical holding power and corrosion resistance required in demanding mechanical environments where fastener reliability directly impacts engine integrity.

Each bolt measures 3/8-16 threads by 1-1/4 inches in length, sized specifically for header applications where standard fasteners fail under thermal cycling and vibration. The 12-point head geometry engages fastening tools with greater surface contact than 6-point alternatives, reducing stripping risk during installation and removal cycles. Nickel plating provides dual functionality: corrosion resistance in high-temperature exhaust environments and electrical conductivity that prevents galvanic corrosion when fastening dissimilar metals. The integral locking feature eliminates the need for separate lock washers or threadlockers, streamlining assembly while ensuring fasteners remain secure through continuous engine operation.

This kit serves engine builders, performance technicians, and serious enthusiasts performing header installation, replacement, or restoration work on Gen I and Gen II small-block Chevy platforms and compatible V6 configurations. Header bolts experience concentrated heat transfer from exhaust manifolds and demand fasteners engineered to resist both thermal stress and mechanical vibration that would loosen inferior hardware. STAGE 8 FASTENERS specializes in locking fastener design for high-vibration and high-temperature automotive applications, positioning this kit as a direct-fit replacement for OEM fasteners or an upgrade path for builders standardizing on superior locking technology.

The 12-piece quantity covers a complete header bolt set for most standard header configurations. Weight of 0.68 lbs reflects the density of steel construction. Choosing fasteners specifically engineered for header applications—rather than generic hardware—is standard practice in any engine build where long-term reliability and minimal maintenance are priorities.