Headers, Dougs, 1965-72 Oldsmobile 400/455 1-3/4", Full-Length

1965-74 Oldsmobile Headers, (400/455, 1-3/4", Long Tube), by Doug’s Headers®

1.75-inch primary tubes, 3.0-inch collectors and steel long-tube construction.

Doug’s Headers® long-tube headers use 1.75-inch primary tubes and 3.0-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: 1.75 inches; collector diameter: 3.0 inches. • Collector connection: 3-Bolt Flange; exhaust-port shape: SAP. • Finish options: metallic ceramic, high-temperature black. • Supplied as a left/right pair with header gaskets and mounting bolts. • Fitment: 1965–69 Oldsmobile 442: 400 cu. in; 1968–71 Oldsmobile 442: 455 cu. in; 1965–68 Oldsmobile Cutlass: 400 cu. in; 1968–69 Oldsmobile Vista Cruiser: 400 cu. in. • Fitment: 1970–74 Oldsmobile Cutlass/Vista Cruiser: 455 cu. in.; 1971–74 Oldsmobile Delta 88: 455 cu. in. Catalytic-converter-equipped applications excluded. • Modify or remove the steering-column lock linkage where fitted. • Cutlass Supreme excluded; automatic-transmission cooler lines must be routed clear of the tubes. • Brake junction-block relocation and engine-mount heat-shield modification may be required.