Dorman 674-492 Exhaust Manifold for Left Side Repair

Dorman 674-492 is a standard replacement exhaust manifold engineered for the left side of select Ford and Lincoln trucks and SUVs. It is built from cast iron with a metallic gray finish and includes the gaskets needed for a complete exhaust manifold repair.

Key Features

• Cast iron construction for durable exhaust service
• Round port design with an 8-hole mounting pattern
• Collector port diameter: 33.25
• No oxygen sensor port and no heat shield included
• Includes gasket/seal components for the repair
• Fits 2018-2021 Lincoln Navigator, left, wo/Ceramic Coating
• Fits 2018-2020 Ford F-150, left, wo/Ceramic Coating

Detailed Description

This Dorman exhaust manifold, part number 674-492, is precision-engineered to match the fit and function of the original manifold on specified vehicles. It is a direct-fit exhaust manifold replacement for the left side of the 2018-2020 Ford F-150 and 2018-2021 Lincoln Navigator, both without ceramic coating. The cast iron body and standard replacement design support a factory-style repair, while the included gaskets help complete the installation.

This part cross-references Monroe Shocks & Struts (e.g., 662987, JL7Z9431A) for the same application.

Common Repair Uses

• Cracked or warped exhaust manifold replacement
• Exhaust leak repair at the manifold-to-cylinder head sealing surface
• Broken gasket or seal service during manifold replacement
• Restoring proper exhaust flow on the left side of the engine
• Repairing noise, odor, or performance issues caused by manifold failure

Installation Notes and Tips

Verify left-side fitment before installation and confirm the vehicle is equipped without ceramic coating. Inspect the cylinder head surface, fasteners, and downpipe connection for wear or damage before assembly. Because this manifold does not include mounting hardware or a heat shield, reuse or source the required related components as needed for the repair.

Quality Assurance

Dorman designs this manifold to match original fit and function on the listed Ford F-150 and Lincoln Navigator applications. The part is built as a standard replacement exhaust manifold for service-focused repairs.