SBC Modified Long Tube Header 1-3/4 - 1-7/8

The SCHOENFELD SBC Modified Long Tube Header 1-3/4 - 1-7/8 (Part #1186V) is a purpose-built exhaust manifold system engineered specifically for small block Chevy competition engines running in IMCA Modified racing. This pair of long-tube headers features 1.75 to 1.875-inch stepped primary tubes that converge into a 3.5-inch collector, designed to optimize exhaust scavenging and flow efficiency across the RPM range where IMCA Modified engines operate. The headers arrive as a complete system with gaskets and hardware included, reducing installation time and ensuring proper fitment without sourcing additional components.

Construction is heavy-duty steel throughout with black paint finish that resists heat cycling and corrosion under sustained engine bay temperatures. The stepped primary design—transitioning from 1.75 inches to 1.875 inches—manages pulse scavenging by matching exhaust gas velocity to engine displacement and fuel mixture characteristics across the operating band. Weighing 31.63 lbs per pair, these headers are substantial enough to handle the thermal and pressure loads of Modified-class competition engines while maintaining the structural integrity required for consistent performance across multiple race seasons.

These long-tube headers are engineered for IMCA Modified racers and small block Chevy engine builders focused on extracting maximum horsepower from displacement-limited classes. The 3.5-inch collector outlet suits typical Modified exhaust systems and allows integration with mufflers, pipes, and heat shielding without modification. Whether preparing a new engine combination or upgrading an existing build, this header set provides the flow characteristics and durability that competition teams depend on for repeatable power delivery and reliability.