Header LS1 Truck GM 67-99 1-7/8in

The Header LS1 Truck GM 67-99 1-7/8in by Schoenfeld is a purpose-built exhaust header engineered for classic and vintage Chevrolet truck platforms seeking LS1 engine swap integration. This header addresses the core challenge faced by LS engine swap enthusiasts: factory exhaust manifolds designed for older truck chassis lack the flow capacity and geometry needed to maximize modern LS1 performance.

Constructed with 1-7/8-inch primary tubes, this Schoenfeld header is sized to efficiently evacuate exhaust gases from LS1 mills while fitting 1967–1999 GM trucks, making it an essential component for any serious restomod or performance upgrade project. Schoenfeld headers are fabricated from high-quality steel tubing and feature mandrel-bent primaries that maintain consistent diameter and minimize turbulence—critical for extracting power from an LS engine's efficient cylinder head design.

The 1-7/8-inch tube diameter strikes an optimal balance between scavenging efficiency and packaging constraints inherent to vintage truck engine bays; larger tubes risk poor velocity at cruise, while smaller tubes create backpressure that strangles peak horsepower. This header's engineering reflects decades of hot-rod and performance automotive experience, ensuring dyno-proven gains in both torque and top-end power when paired with a capable fuel management system and proper ignition tuning. Mechanics and enthusiasts performing LS1 swaps into 1967–1999 GM C-series, K-series, or S-series trucks will find this header to be a vital upgrade.