Dorman 674-385 Exhaust Manifold - Left

Dorman Exhaust Manifold 674-385

This Dorman exhaust manifold is built for direct replacement on select Chevrolet and GMC applications, including left-side service on Astro, Safari, G10, G20, G30, G1500, G2500, G3500, and Caprice models. It is precision-engineered to match original fit and function, with cast iron construction and the necessary gaskets and downpipe hardware for a complete repair.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Includes heat shield
• Includes gasket/seal components for the repair
• Mounting hardware included
• Direct replacement design for specified left-side applications

Detailed Product Overview

Dorman 674-385 is an exhaust manifold replacement for vehicles that need a direct-fit left-side manifold with OE-style geometry. It is engineered to match the original manifold’s fit and function on specified Chevrolet and GMC platforms, helping restore proper exhaust routing and sealing. This part cross-references ATP 101233 for the same application. The Dorman 674-385 is a practical choice for service on 1987-1995 Chevrolet and GMC vans and 1992-1993 Chevrolet Caprice models where the original manifold has cracked, warped, or developed sealing issues.

Vehicle Fitment

• Fits 1989-1995 Chevrolet Astro, left.
• Fits 1989-1995 GMC Safari, left.
• Fits 1987-1994 Chevrolet G10, left.
• Fits 1987-1994 Chevrolet G20, left.
• Fits 1987-1994 GMC G1500, left.
• Fits 1987-1994 GMC G2500, left.
• Fits 1992-1993 Chevrolet Caprice, left.
• Fits 1987-1990 Chevrolet G30, left.
• Fits 1987-1990 GMC G3500, left.

Common Repair Applications

• Cracked or leaking exhaust manifold on the left side
• Exhaust noise from a failed manifold-to-cylinder-head seal
• Warped manifold surfaces that prevent proper sealing
• Broken or missing manifold mounting hardware
• Heat-related exhaust leakage near the engine bay

Installation Notes and Tips

Verify left-side placement before installation and compare the port shape, mounting points, and gasket surfaces to the original part. Clean the cylinder head mating surface thoroughly before assembly, and inspect the downpipe connection for wear or distortion. Use the included gaskets and hardware during installation to help achieve a proper seal on the specified Chevrolet Astro, GMC Safari, and related applications.

Quality Assurance

This manifold is manufactured by Dorman to match the fit and function of the original part on listed vehicles. Cast iron construction, included heat shield, and complete sealing components support a service-ready replacement for the specified applications.