Dorman 674-400 Exhaust Manifold

Durable Cast Iron Exhaust Manifold for Chevrolet, GMC, and Isuzu

The Dorman 674-400 exhaust manifold is engineered to provide reliable exhaust flow for Chevrolet S10, GMC Sonoma, and Isuzu Hombre models. Constructed from cast iron with a natural finish, this exhaust manifold is designed to withstand high temperatures and deliver consistent performance.

• Made from durable cast iron material for long-lasting use
• Natural color finish with round port shape for optimal exhaust flow
• Includes mounting hardware: 3 bolts and 3 lock washers for secure installation
• Comes with a manifold gasket and heat shield to ensure proper sealing and heat protection
• Compatible with Chevrolet S10, GMC Sonoma, and Isuzu Hombre vehicles

Product Details and Specifications

The Dorman 674-400 exhaust manifold features a regular grade type construction, providing a balance of strength and durability suitable for daily driving conditions. Its round port shape is designed to match the exhaust ports on compatible engines, ensuring efficient exhaust gas evacuation. The included heat shield helps protect surrounding components from excessive heat, while the gasket and mounting hardware simplify the installation process. This exhaust manifold is a direct replacement part, engineered to meet OEM specifications for fit and function on Chevrolet S10, GMC Sonoma, and Isuzu Hombre trucks.

Common Applications and Problem Resolution

• Replacement for cracked or warped exhaust manifolds causing exhaust leaks
• Fixes exhaust manifold gasket failures that lead to noise and emissions issues
• Resolves heat damage to surrounding engine components by using the included heat shield
• Addresses mounting hardware corrosion or loss to ensure secure manifold attachment

Installation Notes and Tips

Before installation, ensure the engine is cool to avoid burns. Remove the old manifold carefully, inspecting the exhaust ports for debris or damage. Use the included gasket and mounting hardware to secure the new manifold, tightening bolts to manufacturer torque specifications. The heat shield should be positioned correctly to protect adjacent parts from heat exposure. It is recommended to check for exhaust leaks after installation and retighten bolts if necessary after initial engine warm-up.

Quality Assurance and Warranty Information

Dorman exhaust manifolds are manufactured to meet or exceed OEM standards for durability and fitment. The 674-400 part number comes with a limited warranty covering defects in material and workmanship. This ensures that the exhaust manifold will perform reliably when installed on compatible Chevrolet S10, GMC Sonoma, and Isuzu Hombre vehicles.