Dorman 674-903 Exhaust Manifold - Right

Dorman Exhaust Manifold 674-903

Dorman 674-903 is a cast iron exhaust manifold built to match the original fit and function on specified vehicles. It includes the gasket and downpipe hardware needed for a complete exhaust manifold repair on the right side.

• Cast iron construction for exhaust durability
• Natural finish with round port shape
• Includes gasket and mounting hardware
• Direct replacement for the original manifold on listed applications
• Fits right-side exhaust manifold locations

Vehicle Fitment

• Fits 2003-2011 Ford Crown Victoria, right
• Fits 2003-2011 Lincoln Town Car, right
• Fits 2003-2011 Mercury Grand Marquis, right
• Fits 2003-2004 Ford Grand Marquis, right

Detailed Description

This exhaust manifold is engineered for vehicles that need a replacement for the factory right-side manifold. The cast iron body supports high-temperature exhaust service, while the round port design and OE-style fit help restore proper exhaust routing on Ford Crown Victoria, Lincoln Town Car, and Mercury Grand Marquis applications. Part number 674-903 also cross-references 4W7Z9430AA and 101455 for the same application.

Use Dorman 674-903 when the original manifold is cracked, warped, or leaking at the gasket surface. The included manifold gasket and downpipe hardware support a complete repair and help simplify reassembly on the right side of the exhaust system.

Common Repair Issues

• Exhaust leaks from a cracked manifold
• Ticking or puffing noise at cold start
• Warped sealing surface at the cylinder head
• Broken or corroded manifold mounting points
• Failed gasket sealing at the exhaust connection

Installation Notes

Install on the right side only for the listed vehicles. Inspect the cylinder head surface, fasteners, and downpipe connection before assembly. Clean all mating surfaces thoroughly and follow the vehicle service procedure for torque sequence and heat-cycle recheck.

Quality Assurance

Dorman manufactures this manifold to match the fit and function of the original part on specified vehicles. The package contents include the exhaust manifold, one manifold gasket, two studs, and two nuts.