1991 GMC Sonoma Exhaust Header Parts

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• Header Port Shape: Round
• Quantity: Sold As A Pair.
• with A.I.R. System: No
• Cylinder Head: Stock Profile Heads
• Tuned: No
• Cylinder Head Port Shape: Round
• Header Style: Mid-length Tube
• Manual Transmission - Column: No
• Flange Style: Standard
• Collector Bolts Included: Yes
• Bolts/Studs Included: Yes
• Automatic Transmission - Floor: Yes
• with EGR: No
• Tube Material Thickness:
  • 16g
  • 18g
• Tube Diameter: 1-1/2 In.
• Automatic Transmission - Column: No
• Head Type: Factory Heads
• Package Contents: Headers, Ball And Socket Reducers (exhaust Adapters), Gaskets, Mounting Hardware
• Reducer Outlet Size: 2-1/2 In.
• Tube Size: 1-1/2 In.
• Port Shape: Round
• Tube Length: Mid-length Tubes
• Manual Transmission - Floor: Yes
• Collector Diameter: 2-1/2 In.
• Tube Style: Mid-length
• Variations: 69526, 69528
• Drivetrain: 2wd Only!
• Collector Size: 2-1/2 In.
• Header Finish: Uncoated
• Mounting Hardware Included: Yes
• Weld-Up: No
• Collector Attachment: 2-1/2 In.
• Header Fasteners Included: Yes
• Use With: Trans Dapt. Motor Mount Kit #9906
• Y-Pipe Included: No
• Contents: Headers, Gaskets (when Applicable), 3-bolt Exhaust Adapters, Hardware
• Finish Type: Uncoated Mild Steel
• Notes: 82-00 Gm S10/15, Blazer, Jimmy, Sonoma 2wd Sbc
• Motor Mounts Included: No
• Primary Tube Diameter (in): 1.50 In.
• Crossover Pipe Included: No
• Header Construction:
  • Mild Steel- Standard-duty
  • Standard-duty
• Replacement Head Flange Gasket: 27500
• Tube Design:
  • Mid-length
  • Standard
• Key Feature: 2wd Only.
• Power Steering: Yes
• E.O. #: No
• Exhaust System Dia: 2-1/2 In.
• Flange Thickness:
  • 0.25 In.
  • 0.3125 In.
• Engine: Chevy Sb 283-400 (gen 1) 1958-86
• Air Conditioning: Yes
• Installation Hardware Included: Yes
• Reducers Included: Yes
• Primary Tube Gauge:
  • 16g
  • 18g
• Header Material: Mild Steel
• Title: Hedman Hedders Standard Uncoated Headers; 1-1/2 In. Tube Dia.; 2-1/2 In. Coll.; Stock Heads; Shorty Design
• Catalytic Converter(s) Included: No
• Replacement Gasket: 27500
• Collector Style: Ball And Socket Style (gasketless)
• Emissions Notes: Not Legal For Street Use On '75-later Model Years! Legal For Off-road Use Only.

Hedman Hedders has been manufacturing quality headers in the USA since 1954, and they've been manufacturing Chevy S10, GMC S15, V8 engine swap specific headers for over 20 years. Each set uses mild steel, smooth flowing, CNC mandrel bent tubes, that are hand-welded to ensure each pair is identical to the next. Hedman's unique, gasketless ball and socket collector design allows your Small Block Chevy exhaust system to bolt up, even if it is not perfectly aligned with the header collectors.

These uncoated, MID-LENGTH TUBE headers are designed specifically for installing a Small Block Chevy 283-400 (Gen 1) engine into 1982-2004 Chevy S10/Blazer, GMC S15/Jimmy 2WD trucks. Fits both manual and automatic transmission trucks. The smooth 1-1/2 in. tube design provides ample exhaust flow to let your transplanted 283-400 SB Chevy engine breathe easy, and produce additional horsepower and torque over factory manifolds.

To ensure a proper installation, it is recommended that these headers be installed with Trans-Dapt Performance Product's #9906 engine swap mount kit.

These headers are uncoated, and ship from the factory with a temporary black paint that will burn off when submitted to normal operating temperatures. For protection against the element and lower underhood temperatures, these headers are also available with a silver or black ceramic-metallic finish.

Each set includes a pair of gaskets, header flange bolts and collector bolts. No collector gasket is needed.

Hedman Hedders is so confident in the quality of its headers that these headers are factory backed by a Limited Lifetime Warranty.