64-72 Sb Chevelle Header

The HEDMAN 64-72 SB Chevelle Header is a purpose-built exhaust manifold designed for serious small-block performance enthusiasts who demand maximum flow and reliability from their classic muscle cars. If you own a 1964–1972 Chevrolet Chevelle with a small-block engine and want to unlock genuine horsepower gains while achieving a more aggressive exhaust note, this header delivers the engineering that separates bolt-on upgrades from true performance modifications. Street and strip builders trust Hedman headers because they solve the factory manifold's critical bottleneck: restriction that suffocates scavenging and wastes combustion energy.

Hedman constructed this header with mandrel-bent primary tubes that maintain consistent diameter and smooth radius bends to eliminate turbulent flow patterns that rob power. The tubing design is engineered to optimize exhaust gas velocity and scavenging efficiency—critical factors that improve cylinder evacuation and allow fresh mixture to enter more completely on the intake stroke. Each tube is individually sized and angled to match small-block port locations precisely, ensuring tight fitment and eliminating the misalignment issues common with universal or poorly engineered alternatives. The heavy-duty construction (40.4 lbs) reflects quality steel tubing and robust collector design that withstands sustained heat cycles without warping or cracking.

This header is ideal for owners building street-performance or race-oriented 64–72 Chevelles with small-block displacement, whether running stock engines or upgraded variants like 350, 383, or 406 cubic-inch motors. Installation requires basic mechanical skill and hand tools—disconnect the battery, remove the factory manifolds, and bolt the Hedman header to the cylinder head flanges. Verify clearance with your specific vehicle configuration, as headers in this chassis era sometimes require minor power steering or air conditioning routing adjustments. Pair with a quality exhaust system and carburetor tuning to realize the full 15–25 horsepower gain typical of header upgrades on small-block platforms.