Dorman 674-426 Right Exhaust Manifold 14-20 Chevy Silverado GMC Sierra 12631813
Confirm Fitment Before You Buy
Not sure it fits? Message Year/Make/Model/Engine (2WD/4WD if applicable) and we’ll help confirm compatibility.
Why buy from Koskowski Automotive?
• 50+ years (since 1972) • Dorman Authorized Seller • Fast shipping • Easy returns
Regular price
$118.12
Select your vehicle at the top of the page to check fitment.
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Vehicle Fitment: Use the table below to match your exact configuration. If you don’t see your exact setup, message us before ordering.
This exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It includes all necessary gaskets and downpipe hardware for a complete repair.
- Ideal replacement - this exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the stock manifold on specified vehicles
- Reliable construction - durable materials resist warping, cracking and leaking for long-lasting performance
- Complete repair - includes all necessary gaskets and downpipe hardware
- Trustworthy design - built by industry leader in aftermarket manifolds
Vehicle Fitment
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2019-2020 | Chevrolet | Express 2500 | Right | |
| 2018 | Chevrolet | Express 2500 | Right | 5.3L V8 |
| 2018-2020 | Chevrolet | Express 3500 | Right | |
| 2019-2020 | Chevrolet | Express Cargo | Right | |
| 2018 | Chevrolet | Express Cargo | Right | 5.3L V8 |
| 2014-2018 | Chevrolet | Silverado 1500 | Right | 5.3L V8 |
| 2014 | Chevrolet | Silverado 1500 | Right | 4.3L V6 |
| 2017 | Chevrolet | Silverado 2500 | Right | 5.3L V8 |
| 2019-2020 | GMC | Savana 2500 | Right | |
| 2018 | GMC | Savana 2500 | Right | 5.3L V8 |
| 2019-2020 | GMC | Savana 3500 | Right | |
| 2018 | GMC | Savana 3500 | Right | 5.3L V8 |
| 2016 | GMC | Sierra 1500 | Right | 6.2L V8 |
| 2014-2018 | GMC | Sierra 1500 | Right | 5.3L V8 |
Please confirm the part number and your vehicle's year, make, model and engine before ordering. Questions? Message us with your VIN and we'll check fitment for you.
Specifications
| Brand | Dorman |
|---|---|
| Part Number | 674-426 |
| UPC | 194883186255 |
| Placement | Right |
| Material | Ductile Cast Iron |
| Color | Metallic Gray |
| Mounting Hardware Included | No |
| Gasket Or Seal Included | No |
| Mounting Hole Quantity | 8 |
| Port Shape | Rectangle |
| Collector Port Diameter | 1.8 in. |
| Oxygen Sensor Port | Yes |
| Tube Wall Thickness | 0.125 in. |
| Grade Type | Standard Replacement |
| Heat Shield Included | No |
| Package Contents | 1 Exhaust Manifold |
| Country of Origin | China |
| Warranty | Limited Lifetime |
OE & Interchange Numbers
| 12631813 | General Motors (OE) |
|---|