Dorman 674-423 Exhaust Manifold - Left

OE-Style Exhaust Manifold for Left Side Repair

This Dorman exhaust manifold is precision-engineered to match the fit and function of the original part on specified vehicles. Built from cast iron with a natural finish, it is made for left-side exhaust repair on Ford and Lincoln applications, including the Ford F-150, Ford Expedition, Lincoln Navigator, and Transit van models.

Part number 674-423 includes the gaskets needed for a complete manifold service and is shaped for a round-port, 8-hole mounting pattern. It is a direct replacement choice for restoring exhaust sealing and proper manifold operation on the listed vehicles.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish
• Round port shape
• Left-side application
• Includes inlet gasket and outlet gasket
• 8 mounting holes
• No oxygen sensor port
• Cross-reference: BL3Z9431B

Detailed Description

Dorman 674-423 is an exhaust manifold designed to match the original fit and function on select Ford and Lincoln vehicles. It is built for the left side and uses cast iron construction to handle exhaust heat and long-term service demands. The manifold is engineered for vehicles that require a round-port layout and does not include an oxygen sensor port or heat shield.

This part number 674-423 is listed for 2011-2016 Ford F-150, 2015-2017 Ford Expedition, 2015-2017 Lincoln Navigator, and 2015-2020 Ford Transit-150, Transit-250, Transit-350, and Transit-350 HD, all in the left position. For buyers searching for a left exhaust manifold for Ford F-150 2011-2016 or a replacement exhaust manifold for 2015-2020 Ford Transit-350 left side, this part provides a direct-fit repair path.

Common Repair Uses

• Exhaust leak at the manifold-to-cylinder-head sealing surface
• Cracked or warped original manifold
• Broken manifold flange or mounting points
• Failed exhaust sealing causing noise or odor at the engine bay
• Replacement during left-side exhaust system service on Ford and Lincoln trucks, SUVs, and vans

Installation Notes and Tips

Verify left-side fitment by year, make, model, and engine configuration before installation. This manifold includes the inlet and outlet gaskets, but mounting hardware is not included. Inspect the cylinder-head surface, exhaust flange, and fasteners for wear or damage before assembly. Because this manifold does not have an oxygen sensor port, confirm the vehicle’s original manifold layout matches this design.

Quality Assurance

Dorman manufactures this manifold as a direct replacement part engineered to match original fit and function on the specified applications. Part number 674-423 is built for regular-duty service and is intended to restore proper exhaust sealing on the listed Ford and Lincoln vehicles.