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

The HDR SBC IMCA 1 3/4in -1 7/8-TRI headers by SCHOENFELD represent purpose-built exhaust engineering for serious bracket racers and IMCA dirt track competitors. These tri-Y long-tube headers are designed for small-block Chevrolet (SBC) engines running closed-course competition, where every cubic foot of scavenging efficiency translates directly to lap times and consistency. Built by one of the racing industry's most trusted header manufacturers, this system delivers the exhaust flow characteristics that sanctioned racing demands.

The 1 3/4-inch to 1 7/8-inch tri-Y collector design optimizes primary tube scavenging while managing backpressure across the RPM range critical to oval-track competition. The stepped primary tubing (1 3/4in runner diameter stepping to 1 7/8in in the collector) balances low-end torque response with mid-range power, essential for the acceleration demands of racing applications. SCHOENFELD headers are constructed from mandrel-bent mild steel tubing with precision welding to withstand extreme thermal cycling and vibration loads inherent to competition use. The tri-Y configuration merges three runners into a single collector outlet, minimizing reversion and maximizing scavenging efficiency without the complexity of a full four-into-one design.

IMCA racers and bracket-racing enthusiasts will find these headers ideal for both dirt and asphalt competition where SBC powerplants dominate classes from Modified to Stock Car. Installation requires standard engine bay routing and exhaust system integration; verify frame clearance and transmission positioning before purchase, as long-tube headers demand precise fitment in tight engine compartments. At 37.55 lbs, the complete assembly is substantial enough to ensure durability yet engineered for the weight-conscious racer. This is a direct-bolt header solution for builders targeting maximum reliability and consistent performance gains in sanctioned racing environments.