Dorman 674-250 Exhaust Manifold - Left

Dorman 674-250 Exhaust Manifold for Left Side Service

This Dorman exhaust manifold is precision-engineered to match the fit and function of the original manifold on specified vehicles. Built from cast iron with a natural finish, it is a direct repair solution for left-side exhaust service on select Chevrolet and GMC vans and chassis applications.

It includes the manifold gasket and downpipe hardware needed for a complete repair, helping restore a secure exhaust seal and proper connection at the manifold outlet. The Dorman 674-250 is a practical replacement for worn, cracked, or leaking OE manifold assemblies on Chevrolet P30, GMC P3500, Chevrolet G30, and GMC G3500 applications.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish
• Square port shape
• Includes gasket and mounting hardware
• Direct-fit replacement for the left side
• Package contents: exhaust manifold, manifold gasket, studs, nuts, and springs

Fitment Details

• Fits 1991-1996 Chevrolet G30, left.
• Fits 1991-1996 GMC G3500, left.
• Fits 1989-1995 Chevrolet P30, left.
• Fits 1989-1995 GMC P3500, left.
• Fits 1989-1991 Chevrolet P30, left, V8 350CID 5.7L.
• Fits 1989 Chevrolet P20, left.
• Fits 1989 GMC P2500, left.

Detailed Description

Designed for specified Chevrolet and GMC platforms, this exhaust manifold follows the original fit and function for left-side installation. The cast iron body supports long-term exhaust heat exposure, while the square port design and included gasket help maintain a proper seal at the cylinder head and outlet connection. This part number, 674-250, is a direct replacement choice for service work on Chevrolet P30 and GMC P3500 vans and related heavy-duty applications.

This part cross-references 101101 and 10166143 for the same application.

Common Repair Uses

• Replacing a cracked or warped exhaust manifold
• Repairing exhaust leaks at the manifold-to-head sealing surface
• Restoring a damaged left-side manifold outlet connection
• Addressing ticking or hissing exhaust noise from the manifold area
• Correcting failed manifold hardware or gasket sealing issues

Installation Notes and Tips

Verify left-side placement and confirm engine and model-year fitment before installation. Inspect the cylinder head sealing surface, exhaust flange, and fastener threads for damage or corrosion before assembly. Use the included gasket and hardware during installation, and follow the vehicle service procedure for torque sequence and heat-cycle recheck.

Quality Assurance

Dorman manufactures this manifold to match the fit and function of the original part on specified vehicles. The cast iron construction and included sealing components support a complete exhaust repair on the listed Chevrolet and GMC applications.