SBC Tri-Y Modified Headr

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 to deliver improved scavenging and exhaust flow characteristics essential for competitive oval-track performance. Each header features 1.75 to 1.875-inch primary tubes 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.

Constructed from heavy-gauge steel and finished in durable black paint, these headers arrive ready to install with gaskets and mounting hardware included. The tri-Y configuration is engineered to balance scavenging efficiency at various engine speeds—a critical consideration for modified engines that operate across a wide power band during racing. The 3.5-inch collector diameter accommodates downpipe connections while the stepped primary design manages gas velocity to minimize turbulence and maximize flow. At 35.3 pounds per pair, these headers deliver substantial construction quality without unnecessary weight penalty.

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 make these compliant with standard IMCA Modified engine regulations while delivering the flow characteristics needed to compete. Whether you're building a fresh engine for the track or upgrading an existing combination, this pair provides the exhaust scavenging foundation that supports reliable power delivery throughout a full season of racing.