Dorman 674-231 Exhaust Manifold - Left

Dorman 674-231 Exhaust Manifold for Left Side Repair

Dorman 674-231 is a cast iron exhaust manifold engineered to match the fit and function of the original manifold on specified vehicles. It is built for the left side and includes the gaskets and downpipe hardware needed for a complete exhaust repair on select Chevrolet and GMC trucks and SUVs.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Left-side exhaust manifold for specified applications
• Includes gasket/seal components for the repair
• Mounting hardware included
• Direct replacement design for OE-style fit and function

Detailed Description

This Dorman exhaust manifold, part number 674-231, is precision-engineered for vehicles that require a left-side manifold replacement. It is designed for select 1987-1991 Chevrolet Blazer and GMC Jimmy applications, along with multiple Chevrolet and GMC R-series and V-series trucks and Suburban models from the late 1980s and early 1990s. The cast iron body supports long-term exhaust heat exposure, while the square port layout and included sealing components help restore a proper exhaust connection. This part cross-references ATP 101096 for the same application.

What It Helps Repair

• Exhaust leaks at the manifold-to-cylinder head sealing surface
• Cracked or warped original manifold housings
• Broken or corroded downpipe connection points
• Noise from escaping exhaust gases on the left side
• Failed sealing hardware during manifold replacement

Installation Notes and Tips

Verify engine configuration, left-side placement, and vehicle year before installation. This manifold includes gasket and downpipe hardware, which supports a more complete repair, but the heat shield is not included. Inspect the cylinder head surface, fastener threads, and exhaust flange condition before assembly to help ensure a proper seal on Chevrolet Blazer, GMC Jimmy, and related R/V-series applications.

Quality Assurance

Dorman manufactures this manifold to match the original part’s fit and function on listed vehicles. Part number 674-231 is built as a regular-grade replacement for direct service use on confirmed applications.