GMC C3500 Sierra 7.4L with Tubular Exhaust Manifold System with Air Conditioning with Power Steering with A.I.R. System with Late Model Chassis with Automatic Transmission Column Shifter / with Automatic Transmission Floor Shifter 1989, Standard Duty Tork Stepped Mild Steel Mid-Length Tube Exhaust Headers by Hedman Hedders®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 3". Color: Silver. Header Coating: Ceramic Coating. Header Style: Mid-Length Tube. These standard-duty headers use TORK-STEP stepped tube technology to provide performance superior to any standard tube header design. Originally designed for racing applications, Hedman is the first manufacturer to mass produce this technology for the street.
- HTC coated headers are custom made, therefore, they are non-cancelable and non-returnable
- This is a CARB compliant part, legal for use on vehicles built to meet CARB standards and/or registered in California and other states which follow CARB standards (CARB EO: D167-29)
|Series: Standard Duty Tork Stepped|
|Header Material: Mild Steel|
|Finish: HTC Polished Silver Ceramic-Metallic|
|Header Style: Mid-Length Tube|
|Primary Diameter: 1.75"|
|Collector Diameter: 3"|
|Flange Thickness: 0.375"|
|Crossover Pipe Included: Yes|
|Gasket or Seal Included: Yes|
|Quantity: 2 Pieces|
|Inlet Port Shape: Square|
|System Type: Tork-Stepped|
|Primary Tube Gauge: 16G|
- Made of High Quality Materials
- Built to Last
- MAde in the USA
- One Pair of Headers
- Head Flange Gaskets
- Collector Flange Gaskets
- 3-Bolt Exhaust Adapters
- Mounting Hardware
All Hedman street Hedders are MADE IN THE USA, and are backed by a lifetime warranty against manufacturing defects! HTC coated stainless models also available.
If your engine does not have factory cylinder heads, we strongly recommend you contact the aftermarket head manufacturer to confirm that the deck angle, exhaust port height and spark plug angle/position match the factory cylinder head design, before ordering your headers.
Hedman Hedders®, a prominent header manufacturer for racing and street header marketplaces, started as a one-man shop in 1954. At first the company's products were designed for straightline drag racers. Over time they became highly popular with elite racing engine builders and racers for their outstanding performance and proven reliability. Made to environmental requirements using the latest computer technology, Hedman Hedders headers are guaranteed to outlast any headers you've used before.
WARNING Cancer and Reproductive Harm www.p65warnings.ca.gov CARB To confirm your vehicle's CARB certification, please enter EO number at www.arb.ca.gov