Dorman 674-400 Exhaust Manifold

Dorman 674-400 Exhaust Manifold

This Dorman exhaust manifold is engineered to match the fit and function of the original part on specified vehicles. Built from cast iron with a natural finish, it includes the gasket, heat shield, and mounting hardware needed for a complete exhaust manifold repair on select Chevrolet S10, GMC Sonoma, and Isuzu Hombre applications.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with round port shape
• Includes gasket or seal, heat shield, and mounting hardware
• Direct replacement design for specified OE applications
• Fits 1998-2000 Chevrolet S10, 1998-2000 GMC Sonoma, and 1998-2000 Isuzu Hombre
• Also fits 2003 Chevrolet S10 and 2003 GMC Sonoma TLEV applications
• Part number 674-400 for easy identification

Detailed Description

The Dorman 674-400 exhaust manifold is a regular-grade replacement part designed for vehicles that need an OE-style exhaust manifold service. Its cast iron body supports long-term exhaust heat exposure, while the included gasket, heat shield, and downpipe hardware help complete the repair with the correct supporting components. This part cross-references ATP 101183 for the same application.

Compatible With 1998-2000 Chevrolet S10, 1998-2000 GMC Sonoma, 1998-2000 Isuzu Hombre, and 2003 Chevrolet S10 and 2003 GMC Sonoma Transitional Low Emission Vehicle (TLEV) configurations. If you are searching for a Dorman 674-400 exhaust manifold for a Chevrolet S10 or GMC Sonoma, this listing covers the specified fitment range and OE-style replacement needs.

Common Repair Symptoms

• Exhaust leak at the manifold or gasket surface
• Cracked or warped original manifold
• Broken or missing manifold mounting hardware
• Noise from the exhaust manifold area during cold start or acceleration
• Failed emissions-related exhaust sealing on listed TLEV applications

Installation Notes

Verify engine and emissions configuration before installation, especially on 2003 Chevrolet S10 and 2003 GMC Sonoma TLEV models. Inspect the cylinder head and downpipe sealing surfaces for damage, and replace any worn fasteners or damaged mating components as needed. Confirm the round port shape and fitment details match the original manifold before assembly.

Quality Assurance

Dorman manufactures this exhaust manifold to match original fit and function on the specified vehicles. The cast iron construction, included heat shield, and supplied sealing hardware support a complete repair using the correct replacement components.