Dorman 674-159 Exhaust Manifold - Left

Dorman 674-159 Exhaust Manifold

This Dorman exhaust manifold is engineered to match the original fit and function on specified vehicles, including Chevrolet and GMC applications with left-side mounting. Built from cast iron with a natural finish and square port shape, it is a direct repair choice for restoring exhaust sealing and flow on classic GM trucks, vans, and full-size cars.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Direct-fit replacement for the left side
• Includes gasket and downpipe hardware for a complete repair
• Designed for specified Chevrolet and GMC applications
• Part number 674-159 for easy identification

Detailed Description

The Dorman 674-159 exhaust manifold is precision-engineered to match the original manifold on listed vehicles, helping maintain proper exhaust routing and sealing. It is a practical OE-style replacement for applications such as Chevrolet C10, K10, K20, K30, Blazer, Caprice, Impala, and GMC C1500, C2500, C3500, and related models. This part cross-references ATP 101069 and SKP SK674159 for the same application.

Built from cast iron, this manifold is made for dependable heat and exhaust handling in demanding service conditions. The package includes the manifold gasket, flange, studs, nuts, springs, and washers needed for the repair, making it easier to replace a leaking or cracked manifold and restore proper exhaust connection at the downpipe. The Dorman 674-159 is a direct-fit solution for left-side exhaust manifold replacement on a wide range of 1973-1997 Chevrolet and GMC vehicles.

What It Helps Fix

• Exhaust leaks at the manifold-to-cylinder head sealing surface
• Cracked or warped original manifold castings
• Broken or corroded manifold mounting points
• Noise from a leaking left-side exhaust manifold
• Downpipe connection issues caused by worn hardware

Installation Notes and Tips

Verify engine and emissions configuration before ordering, especially on California Emissions applications noted in the fitment data. Confirm left-side placement and compare the port shape, mounting points, and included gasket/hardware against the original part before installation. Clean the mating surfaces thoroughly and inspect the downpipe flange for wear to help achieve a proper seal.

Quality Assurance

Dorman manufactures this exhaust manifold to match original fit and function on specified vehicles. The cast iron construction and included sealing and mounting components support a complete repair using the correct OE-style replacement approach.