SBC Header 1-5/8

The SBC Header 1-5/8 by SCHOENFELD represents a precision-engineered exhaust manifold purpose-built for small-block Chevrolet performance applications. Designed for automotive enthusiasts and serious engine builders, this header unlocks measurable horsepower gains by dramatically improving exhaust scavenging and reducing backpressure compared to restrictive factory manifolds. Whether you're building a street machine, weekend track warrior, or restoration project, the SBC Header 1-5/8 delivers the flow characteristics needed to maximize your engine's potential.

SCHOENFELD's 1-5/8-inch tube diameter represents the optimal balance between scavenging efficiency and installation practicality for SBC platforms. The header features mandrel-bent primary tubes that maintain consistent internal diameter throughout each runner, eliminating turbulence and flat spots that plague welded designs. This geometry ensures smooth exhaust gas evacuation across the entire RPM band—particularly critical during transition zones where factory headers choke flow and create back-pressure spikes. At 31.05 pounds, the assembly delivers robust construction suitable for both mild and aggressive combinations without compromise.

This header excels in street-driven SBC engines—305, 327, 350, and 383 displacements benefit most from the 1-5/8-inch tube sizing, which avoids the velocity loss of larger piping while maximizing scavenging in standard displacement applications. Fitment is straightforward for most traditional small-block installations, though tight engine bays or heavily modified chassis may require clearance verification given the unit's 20.5 x 10 x 33.5-inch footprint. Pair the SBC Header 1-5/8 with a quality exhaust system and proper tuning for optimal results; dyno testing typically shows 8–15 horsepower gains depending on overall system configuration and engine state of tune.