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OE Quality
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DormanPart #: 674-425
Dorman 674-425 Exhaust Manifold - Left
⚙️ 23 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$149.95Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Chevrolet and GMC, Express 2500, Express 3500, Savana 2500, Savana 3500, Sierra 1500, Silverado 1500, and Silverado 2500
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Exhaust Manifold options
Dorman 674-425 Exhaust Manifold - Left
| Brand | Dorman |
| Part Number | 674-425 |
| Material | Cast iron |
| Material | Hierro fundido |
| Color | Gris metálico |
| Color | Metallic gray |
| Port Shape | Redondo |
| Port Shape | Round |
| Collector Port Diameter | 3 |
| Oxygen Sensor Port | Oui |
| Oxygen Sensor Port | Sí |
| Oxygen Sensor Port | Yes |
| Tube Wall Thickness | 0.125 |
| Mounting Hardware Included | No |
| Mounting Hardware Included | Non |
| Grade Type | Reemplazo estándar |
| Grade Type | Standard replacement |
| Gasket Or Seal Included | Oui |
| Gasket Or Seal Included | Sí |
| Gasket Or Seal Included | Yes |
| Mounting Hole Quantity | 8 |
| Heat Shield Included | Oui |
| Heat Shield Included | Sí |
| Heat Shield Included | Yes |
| Contenidos del paquete | 1 múltiple |
| Contenidos del paquete | 3 arandelas |
| Contenidos del paquete | 3 juntas |
| Contenidos del paquete | 3 tornillos |
| Package Contents | 1 manifold |
| Package Contents | 3 gaskets |
| Package Contents | 3 screws |
| Package Contents | 3 washers |
This part fits 23 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2020 | Chevrolet | Express 2500 | 4.3L | V6 | Left | |
| 2020 | Chevrolet | Express 3500 | 4.3L | V6 | Left | |
| 2020 | GMC | Savana 2500 | 4.3L | V6 | Left | |
| 2020 | GMC | Savana 3500 | 4.3L | V6 | Left | |
| 2019 | Chevrolet | Express 2500 | 4.3L | V6 | Left | |
| 2019 | Chevrolet | Express 3500 | 4.3L | V6 | Left | |
| 2019 | GMC | Savana 2500 | 4.3L | V6 | Left | |
| 2019 | GMC | Savana 3500 | 4.3L | V6 | Left | |
| 2018 | Chevrolet | Express 2500 | 4.3L | V6 | Left | |
| 2018 | Chevrolet | Express 3500 | 4.3L | V6 | Left | |
| 2018 | Chevrolet | Silverado 1500 | 4.3L | V6 | Left | |
| 2018 | GMC | Savana 2500 | 4.3L | V6 | Left | |
| 2018 | GMC | Savana 3500 | 4.3L | V6 | Left | |
| 2018 | GMC | Sierra 1500 | 4.3L | V6 | Left | |
| 2017 | Chevrolet | Silverado 1500 | 4.3L | V6 | Left | |
| 2017 | Chevrolet | Silverado 2500 | 4.3L | V6 | Left | |
| 2017 | GMC | Sierra 1500 | 4.3L | V6 | Left | |
| 2016 | Chevrolet | Silverado 1500 | 4.3L | V6 | Left | |
| 2016 | GMC | Sierra 1500 | 4.3L | V6 | Left | |
| 2015 | Chevrolet | Silverado 1500 | 4.3L | V6 | Left | |
| 2015 | GMC | Sierra 1500 | 4.3L | V6 | Left | |
| 2014 | Chevrolet | Silverado 1500 | 4.3L | V6 | Left | |
| 2014 | GMC | Sierra 1500 | 4.3L | V6 | Left |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
12631812
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.