Dorman 674-198 Exhaust Manifold - Right

Dorman 674-198 Exhaust Manifold for GM Vans

Dorman 674-198 is a cast iron exhaust manifold engineered to match the fit and function of the original part on specified vehicles. It includes the gaskets, heat shield, and downpipe hardware needed for a complete exhaust manifold repair on select Chevrolet G10, G20, G30 and GMC G1500, G2500, G3500 applications.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Includes heat shield
• Includes manifold gasket and flange gasket
• Includes mounting hardware for the downpipe connection
• Direct replacement for the original manifold on listed applications

Detailed Description

This exhaust manifold is built for the right side on 1983-1987 Chevrolet G10, 1983-1987 Chevrolet G20, 1983-1986 Chevrolet G30, 1983-1987 GMC G1500, 1983-1987 GMC G2500, 1983-1986 GMC G3500, and 1987-1988 Chevrolet G30 and GMC G3500 cast iron applications. Dorman 674-198 is shaped to align with the original mounting points and exhaust routing, making it a practical replacement when the factory manifold is cracked, warped, or leaking. This part cross-references ATP 101081 for the same application.

What It Helps Fix

• Exhaust leaks at the manifold or flange
• Cracked or heat-damaged cast iron manifold housing
• Warped sealing surfaces that cause ticking or hissing noises
• Broken or corroded downpipe connection hardware
• Loss of exhaust sealing that can trigger drivability or emissions concerns

Installation Notes and Tips

Verify right-side fitment before installation and compare the original manifold, port shape, and mounting points to the vehicle. Clean the cylinder head and exhaust flange surfaces thoroughly before assembly, and replace any damaged fasteners or mating components as needed. For best sealing results, follow the vehicle service manual torque sequence and torque specifications during installation. Fits 1983-1987 Chevrolet G10, right; Fits 1983-1987 Chevrolet G20, right; Fits 1983-1986 Chevrolet G30, right; Fits 1983-1987 GMC G1500, right; Fits 1983-1987 GMC G2500, right; Fits 1983-1986 GMC G3500, right; Fits 1987-1988 Chevrolet G30, right; Fits 1987-1988 GMC G3500, right.

Quality Assurance

Dorman manufactures this manifold to match original fit and function on the listed vehicles. The included gaskets, heat shield, and downpipe hardware support a complete repair using the specified replacement components.