67-87 GM P/U Header 283-400 Mid Length 1-5/8

The 67-87 GM P/U Header 283-400 Mid Length 1-5/8 is purpose-built for classic Chevrolet pickup enthusiasts seeking measurable exhaust flow improvements without the complexity of full-length headers. Designed for first-generation and second-generation C/K pickups equipped with small-block Chevrolet engines ranging from 283 to 400 cubic inches, this mid-length header strikes a practical balance between performance gains and underbody clearance. Whether you're restoring a vintage truck or upgrading an existing build, this header addresses the factory exhaust bottleneck that limits both horsepower and throttle response on stock or lightly modified engines.

Mid-length headers use 1-5/8 inch primary tubes to optimize scavenging for small-block displacements without the heat soak or installation conflicts that full-length designs create in tight pickup engine bays. The mid-length design routes exhaust away from critical components, reducing underhood temperatures while improving cylinder evacuation and volumetric efficiency. Unlike restrictive factory manifolds, individual tube runners allow each cylinder to pulse independently, preventing backpressure accumulation and freeing up 15–25 horsepower on naturally aspirated builds. The 26-pound weight and compact footprint make this header compatible with stock or upgraded cooling systems while maintaining adequate ground clearance on stock or moderately lowered suspensions.

Mechanics and restorers working on 1967–1987 GM pickups will find this header ideal for carbureted, fuel-injected, or stroker engine swaps within the 283–400 cubic inch window. Installation requires basic hand tools and understanding of exhaust system geometry; the mid-length tube length minimizes downpipe routing challenges common to full-length competitors. Pair this header with a quality dual-exhaust system and matching carburetor or fuel-injection tune for optimal results, particularly on engines with cam timing or ignition modifications. This is a bolt-on upgrade that transforms baseline performance without requiring engine bay modifications or custom fabrication.