The SCHOENFELD SBC Tri-Y Modified Header (part number 1186VY) is a purpose-built exhaust manifold designed specifically for Small Block Chevy engines running in IMCA Modified racing competition. This pair of headers combines traditional tri-Y design with modern manufacturing techniques to enhance scavenging and exhaust flow characteristics essential for competitive oval-track performance.
Each header features primary tubes sized between 1.75 to 1.875 inches that merge into a 3.5-inch collector, optimizing the transition from individual cylinders to a unified exhaust path while maintaining back-pressure control across the RPM range. The stepped primary design manages gas velocity to minimize turbulence and maximize flow, contributing to improved performance. Constructed from durable steel and finished in black paint, these headers are engineered for reliability and performance.
IMCA Modified racers and Small Block Chevy engine builders select these headers for tight-tolerance spec racing where every component must meet stringent class requirements. The tri-Y design and primary tube sizing are tailored to balance scavenging efficiency at various engine speeds, making them ideal for modified engines that operate across a wide power band during racing.
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