Dorman 674-423 Exhaust Manifold - Left

Durable Cast Iron Exhaust Manifold for Ford and Lincoln Vehicles

The Dorman 674-423 exhaust manifold is engineered to provide reliable exhaust flow for select Ford and Lincoln models. Constructed from cast iron with a natural finish, this manifold offers durability and consistent performance for your vehicle's exhaust system.

• Made from robust cast iron material for long-lasting strength
• Natural color finish with round port shape for efficient exhaust flow
• Includes inlet and outlet gaskets for proper sealing
• Designed with 8 mounting holes for secure installation
• Compatible with Ford Expedition, F-150, Lincoln Navigator, and Transit-150/250/350/350 HD models
• Tube wall thickness of 1.3 mm for enhanced heat resistance
• Does not include oxygen sensor port or heat shield

Product Details and Specifications

The Dorman 674-423 exhaust manifold is crafted from cast iron, a material known for its heat tolerance and durability under high-temperature conditions. Its natural finish maintains the integrity of the metal without additional coatings. The round port shape is designed to optimize exhaust gas flow, reducing backpressure and improving engine efficiency. This manifold features a tube wall thickness of 1.3 mm, providing a balance between strength and heat dissipation. It comes with both inlet and outlet gaskets to ensure a proper seal between the manifold and the engine block or exhaust pipe. With 8 mounting holes, the manifold secures firmly to the engine, maintaining alignment and preventing leaks. Note that this part does not include a heat shield or oxygen sensor port, so it is intended for applications where these components are not required or are supplied separately.

Compatible Vehicles and Applications

• Ford Expedition
• Ford F-150
• Lincoln Navigator
• Ford Transit-150
• Ford Transit-250
• Ford Transit-350
• Ford Transit-350 HD

This exhaust manifold is designed specifically for these Ford and Lincoln models, ensuring proper fitment and function. It is ideal for replacing worn or damaged manifolds that cause exhaust leaks, poor engine performance, or increased emissions.

Common Issues Addressed by This Exhaust Manifold

• Exhaust leaks causing noise and reduced engine efficiency
• Cracked or warped manifolds due to heat stress
• Poor engine performance related to exhaust backpressure
• Failed gasket seals leading to exhaust gas escape
• Corrosion or rust damage compromising manifold integrity

Installation Notes and Tips

Ensure the engine is cool before beginning installation. Remove the old manifold carefully, inspecting mounting surfaces for damage or debris. Use the included inlet and outlet gaskets to create a proper seal. Torque mounting bolts evenly to manufacturer specifications to avoid warping. Since mounting hardware is not included, use existing bolts or source appropriate replacements. Verify compatibility with your specific vehicle model and engine configuration before installation.

Quality Assurance and Warranty

Dorman exhaust manifolds are manufactured to meet or exceed OEM standards for fit and function. The 674-423 part number undergoes quality checks to ensure durability and performance. This product includes a gasket set to support proper sealing. Warranty coverage details should be confirmed with the distributor or manufacturer, as they may vary by region.