SBC Stock Car Header 1-3/4in x 1-7/8in

The SBC Stock Car Header 1-3/4in x 1-7/8in by Schoenfeld is a purpose-built exhaust manifold engineered for small-block Chevrolet racing and high-performance street applications. This header is designed for builders and mechanics who demand maximum exhaust scavenging efficiency without the complexity of tuned tube systems. Whether you're assembling a stock-class race engine, building a vintage stock car, or upgrading a street machine, this header delivers the fundamental performance improvement that comes from replacing restrictive cast iron manifolds.

Constructed with mandrel-bent primary tubes measured at 1-3/4 inches and 1-7/8 inch collector dimensions, this header optimizes flow velocity and pressure pulse management across the entire RPM range typical of stock-class competition. The tubing diameter progression is calculated to balance backpressure with scavenging—critical factors that directly influence cylinder filling and fuel economy in naturally aspirated engines. Schoenfeld's manufacturing process ensures consistent wall thickness and smooth internal transitions, eliminating turbulence points that waste energy.

This header is ideal for small-block Chevrolet engines ranging from 283 to 400 cubic inches, making it compatible with vehicles spanning various racing and street applications. The 29.3-pound assembly integrates cleanly into tight engine compartments, making installation straightforward for builders working within stock car rules or street-legal build parameters. With its robust design, this header is a reliable choice for enhancing performance in competitive settings.