SBC Modified Headers Long Primaries

The SBC Modified Headers Long Primaries from Schoenfeld are purpose-built exhaust manifolds designed specifically for small-block Chevrolet engines. These headers are ideal for modified applications, street performance builds, and circle track racing, addressing the challenge of extracting peak horsepower while ensuring reliable scavenging across the RPM range.

Featuring long primary tube designs, these headers enhance low- and mid-range torque by optimizing exhaust gas velocity and reducing backpressure. The extended primary tubes are individually tuned to match exhaust pulse frequencies, promoting efficient cylinder scavenging without cross-cylinder interference. Constructed from mandrel-bent steel tubing with precision welds, they are built to withstand sustained heat cycling and vibration.

These modified headers are particularly beneficial for SBC enthusiasts looking to upgrade their performance, providing compatibility with modern emission systems and bolt-on components. They are designed to maximize power production in the 5,000–7,000 RPM range, making them suitable for both street and track applications.