GMC R3500 Headers

GIBSON PERFORMANCE HEADERS, STAINLESS STEEL, NICKEL CHROME PLATED, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.5 in. tube diameter, 14-gauge tube wall thickness, stock flange connector, 0.375 in. standard head flange; Includes head gasket, washers, nuts, bolts, and exhaust donut; Shorty style; Round head port; Made of nickel chrome plating heavy duty 14-gauge mandrel-bent tubing to maintain constant exhaust flow for outstanding performance; Feature heavy duty 0.375 in. thick laser cut port flanges and OEM style connections; Dyno-tuned and engineered to deliver more usable horsepower and torque; Improves the engine's efficiency by allowing it to breathe easier and run at cooler temperature; Well suited for lowered and raised vehicles, street, and off-road; Dyno tested to perform best with Gibson's cat-back exhaust system; Will not fit if vehicle has dual air fitting; Will not fit on old body style; For vehicles without air injection.

Fits the following 1988-1991 GMC R3500 submodels:

• 1990-1991: SLE; 8 Cyl 5.7L;
• 1988-1991: Base; 8 Cyl 5.7L;

• 1988-1989: High Sierra; 8 Cyl 5.7L;

• 1988-1989: Sierra Classic; 8 Cyl 5.7L;

Fits 2 more submodels. (Show all) Show less info

HEDMAN STANDARD DUTY EXHAUST HEADERS, BLACK-PAINTED -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.625 in. tube diameter, 18-gauge tube wall thickness, 3 in. flange collector, 0.25 in. standard head flange; Premium gasket and installation hardware included; Without smog injection or injection heads; Full-length style; Round head port; They feature 18-gauge mandrel-bent primary tubes; Protected by factory applied black paint for pre-installation protection; Made in USA; Modification to stock exhaust required to retain catalytic converter; Must modify rotary A/C bracket; Elite replacement gasket part number 27520; Modification to clutch linkage may be needed; Late model chassis; Engine offset to passenger side of vehicle.

Fits the following 1988-1991 GMC R3500 submodels:

• 1990-1991: SLE; 8 Cyl 5.7L;
• 1988-1991: Base; 8 Cyl 5.7L;

• 1988-1989: High Sierra; 8 Cyl 5.7L;

• 1988-1989: Sierra Classic; 8 Cyl 5.7L;

Fits 2 more submodels. (Show all) Show less info

FLOWTECH I STANDARD FULL-LENGTH HEADERS, SATIN BLACK HI-TEMPERATURE PAINTED -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.625 in. tube diameter, 16-gauge tube wall thickness, 3 in. weld-on collector, standard head flange; All mounting hardware such as bolts, nuts, and premium gasket are included; Full-length style; Round head port; These headers are precision-engineered and leak-tested to provide the maximum performance and fuel efficiency of your engine; Formed from specially selected 0.060 cold roll flash controlled tubing with high quality electrostatically-applied satin black paint finish; They feature Flowtech's exclusive, thick, and mandrel-formed power plenum collector; All ports are precisely fitted and finished with sturdy and leaf-proof o-ringed port seals; Must modify stock exhaust to retain catalytic converters; Applications with oxygen sensor use reducer part number 10105 for 2.5 in. 3-bolt flange or part number 10110 for 3 in. 3-bolt flange; Will not fit angle plug heads; Fits with OE factory equipped style transmission only; Catalytic converter compatible y-pipe available separately.

Fits the following 1988-1989 GMC R3500 submodels:

• 1988-1989: Base; 8 Cyl 5.7L;
• 1988-1989: High Sierra; 8 Cyl 5.7L;

• 1988-1989: Sierra Classic; 8 Cyl 5.7L;

Fits 1 more submodels. (Show all) Show less info

PATRIOT SPECIFIC FIT HEADERS, METALLIC CERAMIC-COATED, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.625 in. tube diameter, 3 in. collector; Includes gaskets, hardware, collector reducers, and installation instructions; Full-length style; Oval port shape; Features ceramic coated tubing that is corrosion and rust resistant; Lowers under hood temperatures for more power and extended product life; Easy to maintain; It has thick machined flanges for great seal; Its high flow mandrel-bent mild steel tubing provides greater horsepower and torque; Fits D-port cylinder heads including ZZ4 crate engines; Will fit most angle plug heads; Non-catalytic converter equipped; Reducers available with oxygen sensor fitting; Installation requires left side A/C bracket part number H7608; 1979 and later vehicles with short compressors can use the stock bracket.

Fits the following 1987-1987 GMC R3500 submodels:

• 1987-1987: Base; 6 Cyl 4.8L;
• 1987-1987: Base; 8 Cyl 5.7L;

• 1987-1987: Base; 8 Cyl 6.2L;

• 1987-1987: Base; 8 Cyl 7.4L;

• 1987-1987: High Sierra; 6 Cyl 4.8L;

• 1987-1987: High Sierra; 8 Cyl 5.7L;

• 1987-1987: High Sierra; 8 Cyl 6.2L;

• 1987-1987: High Sierra; 8 Cyl 7.4L;

• 1987-1987: Sierra Classic; 6 Cyl 4.8L;

• 1987-1987: Sierra Classic; 8 Cyl 5.7L;

• 1987-1987: Sierra Classic; 8 Cyl 6.2L;

• 1987-1987: Sierra Classic; 8 Cyl 7.4L;

Fits 10 more submodels. (Show all) Show less info

HOOKER COMPETITION FULL-LENGTH HEADERS, BLACK HI-TEMPERATURE PAINT -- 1.625 in. tube diameter, 16-gauge tube wall thickness, 2.5 in. flange collector, 8 in. collector length, 0.3125 in. standard head flange; They include all the necessary hardware for complete installation; Sap shape port; Full-length style; They feature tuned-length primary tubes for maximum exhaust scavenging and velocity, light but sturdy 16-gauge mild steel mandrel-bent tubing for smooth exhaust flow, long transition collector for decreased back pressure, and machined flanges for a perfect seal; Designed for optimal performance and industry's best welds for durability; Exhaust systems can also be fabricated using either Hooker Super Competition Aero Chamber mufflers, Maximum Flow mufflers, Super Competition turbo mufflers, Competition turbo mufflers or header type Hooker mufflers; Equipped with a fitting to accept the stock oxygen sensor; With Hooker's limited warranty.

Fits the following 1988-1989 GMC R3500 submodels:

• 1988-1989: Base; 8 Cyl 5.7L;
• 1988-1989: High Sierra; 8 Cyl 5.7L;

• 1988-1989: Sierra Classic; 8 Cyl 5.7L;

Fits 1 more submodels. (Show all) Show less info