Wedge Locking Header Bolts 3/8 x 1in L (12)

PROFORM Wedge Locking Header Bolts 3/8 x 1 inch (12-pack) are precision fasteners designed for high-temperature exhaust manifold and header assembly applications. These bolts are essential for performance engine builders who need to maintain tightness under thermal cycling and vibration. Their innovative design addresses a common issue faced in automotive applications, ensuring reliability and performance.

The wedge locking mechanism creates mechanical interference between the bolt and the threaded hole as torque is applied, effectively preventing loosening without the need for additional lock washers or thread-locking compounds. This feature is particularly beneficial in environments with aluminum cylinder heads and cast-iron manifolds, where thermal expansion and contraction can lead to fastener failure. The 3/8-inch diameter and 1-inch length are optimized for standard small-block and mid-size engine header applications.

Engine rebuild specialists, street rod builders, and performance shops rely on these wedge locking header bolts for both new installations and restoration projects. Each pack includes 12 bolts, which is typically sufficient for most four-cylinder and six-cylinder header setups. Upgrade your engine's performance and reliability with these high-quality fasteners.