Dorman 674-646 Exhaust Manifold - Left

Dorman 674-646 Exhaust Manifold for Left Side Repair

The Dorman 674-646 exhaust manifold is engineered to match the fit and function of the original manifold on specified vehicles. Built from cast iron with an oval port shape, it is a direct repair option for left-side exhaust manifold replacement on select Ford, Lincoln, and Mercury models.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish
• Oval port shape for OE-style fitment
• Includes gasket and seal components for the repair
• Mounting hardware included
• Regular grade replacement part
• Part number: 674-646

Detailed Description

This Dorman exhaust manifold is designed for vehicles that need a left-side manifold replacement with OE-style dimensions and mounting points. It includes the necessary gaskets and downpipe hardware for a complete repair, helping restore proper exhaust routing and sealing at the cylinder head and flange connection. The Dorman 674-646 is a practical choice for 2007-2012 Ford Edge, 2009-2012 Ford Flex, 2010-2012 Ford Fusion, 2008-2011 Ford Taurus, 2008-2009 Ford Taurus X, 2007-2010 Ford Lincoln MKX, 2007-2012 Lincoln MKZ, 2009-2010 Lincoln MKS, 2010-2011 Lincoln MKT, and 2008-2009 Mercury Sable left-side applications. This part cross-references Ford OE number 7T4Z9431C for the same application.

Common Problems This Part Can Address

• Cracked or warped exhaust manifold housing
• Exhaust leaks at the manifold or flange connection
• Broken or corroded manifold mounting points
• Noise from a leaking left-side exhaust manifold
• Failed sealing surfaces that affect exhaust flow

Installation Notes and Tips

Verify engine and left-side fitment before installation. Inspect the cylinder head surface, flange area, and fasteners for damage or corrosion before assembly. Replace any worn sealing surfaces and follow the vehicle service procedure for torque sequence and heat-cycle recheck. This manifold is intended for left-side installation on the listed Ford, Lincoln, and Mercury vehicles.

Quality Assurance

Dorman manufactures this manifold to match original fit and function on specified vehicles. The cast iron construction, included gasket components, and supplied mounting hardware support a complete exhaust manifold repair.