SBC Chassis Headers 1-5/8

The Schoenfeld SBC Chassis Headers 1-5/8 (Model 151E) is a pair of performance headers purpose-built for small block Chevrolet engines seeking improved exhaust scavenging and horsepower gains. Featuring 1.625-inch primary tubes that flow into a 3-inch collector, these headers are engineered to maximize exhaust velocity while minimizing backpressure—a critical factor in extracting measurable power gains from naturally aspirated small block platforms. The black painted steel construction resists corrosion under typical underhood conditions, and the inclusion of gaskets and installation hardware ensures a complete, ready-to-install package.

The 1-5/8 primary tube diameter represents a proven compromise between small block displacement and exhaust scavenging efficiency. Tubes of this size are optimized for street and mild performance engines in the 350–400 cubic inch range, where they deliver header flow characteristics that work across broad RPM bands rather than favoring a narrow peak. The 3-inch collector consolidates the four primary tubes into a single outlet, facilitating installation to a single downpipe or dual exhaust system. The supplied gaskets and hardware eliminate the need for sourcing additional components, reducing installation time and ensuring compatibility from the factory flange forward.

Schoenfeld headers appeal to small block Chevrolet builders and restoration enthusiasts who prioritize flow efficiency and reliable fitment. These chassis headers serve both street machines seeking a straightforward power increase and entry-level competition builds where header performance and cost-effectiveness must align. Installation requires removal of the original cast iron manifolds and connection of the supplied hardware to existing mounting points—standard procedure for most small block applications. The black finish provides a factory-appearance alternative to high-heat coatings, making these headers suitable for street use where authentic aesthetics matter alongside performance gains.