67-86 2wd & 82-86 4wd P/

The Hedman 67-86 2wd & 82-86 4wd performance headers are purpose-built for Small Block Chevy engines in full-size GM trucks and SUVs, delivering the kind of exhaust scavenging efficiency that serious engine builders and weekend warriors demand. These street-legal headers exist because restrictive factory manifolds rob horsepower and create backpressure that limits breathing at higher RPMs. Whether you're tuning a carbureted 350 or modernizing a vintage 4x4 with improved exhaust flow, these headers address the fundamental constraint that factory equipment imposes on your engine's potential.

Constructed from mandrel-bent steel with a metallic ceramic coating, the Hedman headers feature 1.625-inch primary tubes that merge into a 3-inch collector, optimizing scavenging across the Small Block Chevy's firing order. The ceramic finish resists thermal oxidation and corrosion while reducing underhood temperatures—a critical advantage in tight truck engine bays where radiant heat affects fuel mixture and component longevity. All necessary gaskets and hardware are included, ensuring hassle-free installation without sourcing fasteners or sealing compounds separately. This pair configuration delivers symmetrical exhaust flow and balanced cylinder scavenging, eliminating the uneven backpressure that compromises power delivery.

These headers are ideal for owners of 1967–1986 two-wheel-drive trucks and 1982–1986 four-wheel-drive models who want measurable gains in torque response and peak horsepower without sacrificing street drivability. Installation requires basic mechanical skill and standard hand tools; factory exhaust manifold removal and header bolt-down typically takes 2–3 hours depending on engine bay accessibility. The 33.41-pound assembly fits within factory engine compartments designed for Small Block Chevys, and the street certification means you maintain emissions compliance while gaining performance. Pair these with a quality exhaust system downstream to realize the full benefit of improved primary scavenging.