Brand New Pair of Southwest Speed Painted Flat Black Performance Long Tube Headers for 1975-1991 GM Trucks with Big Block Chevy 396-454 Cu. In. Engines (Part #440-2445). This pair of Southwest Speed Performance Long Tube Headers offer an immediate increase in performance by eliminating backpressure, improving exhaust flow, and building more horsepower. The consistent tubing diameter contributes to the smooth air flow and greater exhaust velocity of these headers. These headers are a direct replacement for 1975-1991 Chevy & GMC Trucks, Suburban's, Blazers, and Jimmy's with Big Block Chevy 396-454 Cu. In. Engines. These headers are Ground parallel with .380" flanges on the cylinder head surface, and feature 1 3/4" Primary tubes with 3" collectors, complete with header bolts and gaskets and reducer bolts and gaskets. Includes a pair of 2 1/2" reducers to complete the installation. Applications: GM Trucks with Big Block Chevy 396-454 Cu. In. Engines Chevy: 1975-1987 1/2 Ton Trucks 2WD 1975-1981 1/2 Ton Trucks 4WD 1975-1987 3/4 Ton Trucks 2WD 1975-1981 3/4 Ton Trucks 4WD 1975-1987 1 Ton Trucks 2WD 1975-1987 K5 Blazer 2WD 1975-1981 K5 Blazer 4WD 1975-1991 Suburban 2WD 1975-1981 Suburban 4WD GMC: 1975-1987 1/2 Ton Trucks 2WD 1975-1981 1/2 Ton Trucks 4WD 1975-1987 3/4 Ton Trucks 2WD 1975-1981 3/4 Ton Trucks 4WD 1975-1987 1 Ton Trucks 2WD 1975-1987 Jimmy 2WD 1975-1981 Jimmy 4WD 1975-1991 Suburban 2WD 1975-1981 Suburban 4WD Notes: Must modify stock exhaust to retain catalytic converter(s). Applications with oxygen sensor will require purchase of reducers with O2 fittings. Will not fit with A.I.R. (SMOG) Pump. Must use original factory Big Block frame stands, motor mounts and hardware. Works with Air Conditioning. Features: Performance Long Tube Headers 1 3/4" Primaries to the 3" Collectors 2 1/2" Reducers More Performance Increases Horsepower & Torque Better Fuel Mileage Great Choice to replace cast iron exhaust manifolds Enhances the looks of the engine compartment Includes gaskets and mounting hardware Painted Flat Black to resist early corrosion Header Specs: Material Type: Steel Header Tube Type: Long Tube Flange Thickness: .380" Finish: Painted Flat Black Hardware Included: Yes Gaskets Included: Yes Tube Outside Diameter: 1 3/4" Collector Diameter: 3" Reducers: 2 1/2" Paint Warning: These headers are painted with a high heat dull black paint. It will generally dull even more when the engine is started. The header paint will smoke and let off an odor the first few times the engine is up to temperature and the black finish will become duller turning closer to gray in color. If exhaust temperatures are extreme at start the paint will blister and peel. There is no warranty on header paint. Header Return Policy: Please refer to the header measurement chart below to make sure the header will fit your vehicle and application before ordering. In the event you order a header that will not fit your vehicle and application, you may return them for a refund, providing you don't damage the header. When you receive the header the finish will be protected and must remain unscratched for a refund. If you bend or dimple any of the tubes or scratch the finish, we will not be able to sell the header and will not be able to process a refund. Use care when trial fitting headers. Repack them well to prevent damage returning them to us. We won't process refunds for scratched, dimpled, dented, or bent headers. You can view and download the instruction booklet for these headers here.
