HDR SBC IMCA 1 3/4in -1 7/8-TRI

The HDR SBC IMCA 1 3/4in -1 7/8-TRI headers by SCHOENFELD are purpose-built exhaust manifolds designed specifically for serious racers and high-performance engine builders working with small-block Chevrolet platforms in IMCA-sanctioned competition. These headers are engineered to address the core challenge of extracting maximum horsepower while managing exhaust scavenging efficiency and thermal stress.

The tri-y tube design (TRI designation) optimizes exhaust gas velocity by merging individual cylinder runners into strategically angled collector sections. This design reduces backpressure while maintaining scavenging pulses that enhance cylinder filling on the intake stroke. Constructed from heavy-gauge steel with mandrel-bent tube geometry, these headers are built to withstand the thermal cycling and vibration inherent to race environments.

Ideal for competitive environments where engine reliability is crucial, the HDR SBC IMCA headers deliver the flow characteristics and durability required for success on race day. Their design accommodates a range of engine displacements, making them suitable for various applications within the IMCA framework, including larger displacement variants.