SBC IMCA Headers 1-5/8 - 1-3/4

The Schoenfeld SBC IMCA Headers 1-5/8 - 1-3/4 (Model 161-98H) are specialized exhaust manifolds designed for small-block Chevrolet engines, ideal for IMCA racing circuits and street performance applications. These headers cater to racers and enthusiasts who prioritize maximum scavenging efficiency and unrestricted exhaust flow on budget-friendly, high-revving small-block platforms.

Featuring a stepped primary tube design, these headers have 1-5/8 inch primary tubes that merge into 1-3/4 inch secondaries. This configuration optimizes exhaust gas velocity across the RPM range while minimizing turbulence and heat loss. The tuned-length collector design enhances pulse-wave scavenging, improving volumetric efficiency without altering engine displacement.

Ideal for IMCA racers and circle-track competitors, these headers are built with welded construction and mandrel-bent tubing to ensure durability under the thermal and vibration stresses of racing environments. Schoenfeld's reputation for precision in tuned-length headers makes this product a reliable choice for serious builders seeking both performance and dependability.