Headers, Dougs, 1968-74 Chevrolet A-Body 396-502, 1-7/8", Full Length

1968-81 GM Headers, (Chevy Big Block, 1-7/8", Long Tube), by Doug’s Headers®

1.875-inch primary tubes, 3.5-inch collectors and steel long-tube construction.

Doug’s Headers® long-tube headers use 1.875-inch primary tubes and 3.5-inch collectors. The steel tubes meet 3/8-inch head flanges, and the pair includes header gaskets and mounting hardware. Choose metallic ceramic or high-temperature black according to the selected option.

• Construction: steel long-tube headers; 16-gauge tubing and 3/8-inch head flanges. • Primary tube diameter: 1.875 inches; collector diameter: 3.5 inches. • Collector connection: 3-Bolt Flange; exhaust-port shape: Round. • Finish options: metallic ceramic, high-temperature black. • Supplied as a left/right pair with header gaskets and mounting bolts. • Fitment: 1968–70 Chevrolet Chevelle & El Camino: 396 cu. in; 1970–73 Chevrolet Chevelle: 454 cu. in; 1970–72 Chevrolet Chevelle/Camaro/El Camino: 402 cu. in; 1970–75 Chevrolet El Camino: 454 cu. in; 1973–75 Chevrolet Malibu: 454 cu. in. • Fitment: 1973–81 Chevrolet Camaro; 1976–77 Chevrolet El Camino/Malibu; 1970–81 Pontiac Firebird. Chevrolet 396–502 big-block engine conversion. • Use big-block engine mounts and frame stands. • Manual clutch linkage and automatic cooler lines require clearance during installation. • 1973–74 chassis may require primary-tube clearance work at the narrower frame; follow the illustrated instructions.