Header LS1 78-99 GM 2wd Truck

The Schoenfeld Header LS1 78-99 GM 2wd Truck is a purpose-built exhaust manifold system designed for GM trucks equipped with LS-series engines. This header pair transforms restrictive factory cast-iron manifolds into a free-flowing stainless steel solution that improves exhaust scavenging, reduces backpressure, and unlocks hidden horsepower. Built for enthusiasts tackling LS swaps or modernizing classic 1978–1999 GM two-wheel-drive trucks, these headers are an essential foundation for any serious engine upgrade.

Constructed from mandrel-bent steel with black powder-coat finish, the Schoenfeld Header LS1 78-99 GM 2wd Truck features 1.75-inch primary tubes that merge into a 3-inch collector, optimizing gas flow for mid-range and top-end performance. The pair includes gaskets and hardware for complete bolt-on installation, plus pre-drilled O2 sensor bungs for seamless integration with engine management systems. This design balances diameter for natural aspiration builds while maintaining structural integrity and heat resistance—critical factors when routing hot exhaust gases in tight engine bay configurations common to vintage truck platforms.

Ideal for LS-swap conversions or restomod builds, this header system is a direct bolt-on replacement that requires no welding or extensive fabrication. Truck owners upgrading from carbureted 350s or 454s to modern LS1/LS2 mills will appreciate the engineered fit and performance gains without sacrificing reliability. Pair with a quality cat-back exhaust and tune for optimal results. Weighing 31.3 lbs per pair, installation typically takes 2–4 hours with basic hand tools and a lift. Compatible exclusively with GM LS-series engines in 1978–1999 two-wheel-drive truck applications.