Dorman 674-390 Exhaust Manifold - Right

Exhaust Manifold for Right-Side Repair

This Dorman exhaust manifold is built for specified Chevrolet and GMC applications that use an air pump on the right side. It is engineered to match the original fit and function, with cast iron construction and the necessary gasket and downpipe hardware for a complete exhaust repair.

Key Features

• Direct replacement exhaust manifold for the right side
• Cast iron construction with a natural finish
• Square port shape for the specified applications
• Includes gasket and mounting hardware for installation
• Package contents: exhaust manifold, manifold gasket, 3 studs, and 3 nuts
• Part number 674-390 for catalog and fitment reference

Detailed Description

Dorman 674-390 is a replacement exhaust manifold designed for 1996-2000 Chevrolet C2500, C3500, Express 3500, K2500, and K3500, plus 1996-2000 GMC C2500, C3500, K2500, K3500, and Savana 3500 on the right side with air pump applications. It also covers 1996-1999 Chevrolet C2500 Suburban, K2500 Suburban, and P30, along with 1996-1999 GMC C2500 Suburban, K2500 Suburban, and P3500. The cast iron body is built to match the original manifold’s fit and function on the listed vehicles, helping restore proper exhaust routing and sealing. This part cross-references ATP 101197 for the same application.

What This Part Helps Address

• Exhaust leaks at the manifold sealing surface
• Cracked or warped original manifold housing
• Broken or missing manifold studs and nuts
• Noise from a leaking right-side exhaust manifold
• Fitment issues on replacement repairs for Chevrolet C2500, GMC K3500, and related models

Installation Notes and Tips

Verify right-side fitment and air pump application before installation. Inspect the cylinder head sealing surface, fasteners, and downpipe connection for damage or corrosion before assembly. Use the included gasket and hardware during installation, and follow the vehicle service procedure for torque sequence and final tightening. Confirm clearance around adjacent exhaust components after the manifold is installed.

Quality Assurance

This Dorman manifold is precision-engineered and durably manufactured to match original fit and function on the listed Chevrolet and GMC vehicles. It is a regular-grade replacement part built for direct-fit exhaust repair.