BBC Dyno Header 2 1/8in 4in Collector

The BBC Dyno Header 2 1/8in 4in Collector by SCHOENFELD is a purpose-built exhaust manifold designed for Big Block Chevrolet engines pushing serious power on the dyno and street. This header exists because stock cast manifolds choke airflow and waste horsepower—serious engine builders and mechanics turn to SCHOENFELD headers to unlock peak performance from BBC platforms. Whether you're tuning a high-output stroker or optimizing a fuel-injected race engine, this header addresses the fundamental need for efficient scavenging and low-restriction exhaust evacuation.

The 2 1/8-inch primary tube diameter is sized to match BBC cylinder head port exit velocities, ensuring optimal scavenging without excessive back-pressure that kills mid-range torque. The 4-inch collector consolidates primary runners into a single outlet, allowing for either direct bolt-on secondary piping or integration with a turbocharger or supercharger system. SCHOENFELD headers are constructed from heavy-duty steel tubing with mandrel bends to maintain consistent wall thickness and flow characteristics—no kinks, no dead zones.

The dyno-tested design minimizes reversion and turbulence, translating to measurable gains in peak horsepower and torque across the RPM band. This header suits engine builders, performance shops, and DIY mechanics upgrading BBC engines in hot rods, muscle cars, and race vehicles. Installation typically requires custom or semi-custom fabrication to fit your specific block orientation and vehicle.