Dorman 674-399 Exhaust Manifold - Left

Overview of Dorman 674-399 Exhaust Manifold

The Dorman 674-399 exhaust manifold is designed for reliable performance in Ford and Lincoln vehicles, including the Expedition, F-150, F-250, and Navigator models. Crafted from durable cast iron, this exhaust manifold ensures consistent exhaust flow and long-lasting durability.

• Constructed from cast iron for strength and heat resistance
• Natural color finish with round port shape for optimal exhaust flow
• Includes mounting hardware: 2 bolts and 2 nuts for secure installation
• Comes with one manifold gasket to ensure a proper seal
• Grade type: Regular, suitable for standard replacement needs
• Compatible with Ford Expedition, F-150, F-250, and Lincoln Navigator

Detailed Product Description

This Dorman exhaust manifold (part number 674-399) is engineered to meet OEM specifications for a precise fit and reliable operation. The cast iron construction provides excellent resistance to heat and corrosion, which is essential for managing exhaust gases in Ford and Lincoln trucks and SUVs. The round port shape is designed to match the cylinder head ports, promoting efficient exhaust gas evacuation and helping maintain engine performance. The natural finish preserves the integrity of the material without additional coatings that may degrade over time.

Compatible Vehicles and Applications

This exhaust manifold is compatible with the following vehicles:

• Ford Expedition
• Ford F-150
• Ford F-250
• Lincoln Navigator

It is ideal for replacing worn or damaged exhaust 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
• Failed gasket seals leading to exhaust gas escape
• Decreased fuel economy from improper exhaust flow
• Check engine light triggered by exhaust system faults

Installation Notes and Tips

The Dorman 674-399 exhaust manifold includes all necessary mounting hardware and a gasket to simplify installation. It is recommended to clean the mounting surface thoroughly before installation to ensure a proper seal. Torque bolts to manufacturer specifications to avoid warping or leaks. This part is designed for direct replacement on compatible Ford and Lincoln models, making it suitable for professional mechanics and experienced DIY installers.

Quality Assurance and Warranty

Dorman exhaust manifolds are manufactured to meet or exceed OEM standards for fit, form, and function. The 674-399 part number undergoes rigorous quality control to ensure durability and performance. This product includes a limited warranty covering defects in materials and workmanship, providing confidence in its reliability for Ford Expedition, F-150, F-250, and Lincoln Navigator applications.