Dorman 674-729 Exhaust Manifold - Left

Dorman 674-729 Exhaust Manifold

Dorman 674-729 is a cast iron exhaust manifold engineered to match the fit and function of the original part on specified vehicles. It includes the gasket, flange, and downpipe hardware needed for a complete repair, along with a heat shield for added thermal protection.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Includes gasket or seal and heat shield
• Mounting hardware included for installation
• Package contents support a complete manifold replacement
• Compatible with left-side applications on select Chevrolet and GMC trucks and SUVs

Detailed Description

This Dorman exhaust manifold is built for direct replacement on select Chevrolet Silverado 2500 HD, Silverado 3500, Suburban 2500, Avalanche 2500, GMC Sierra 2500 HD, Sierra 3500, and Yukon XL 2500 applications. The part number 674-729 is designed for left-side use on vehicles without A.I.R., and its cast iron construction helps maintain the original manifold’s fit and function. For buyers searching for a left exhaust manifold for 2001-2006 Chevrolet Silverado 2500 HD or a replacement exhaust manifold for 2001-2006 GMC Sierra 3500, this part provides the correct OE-style service solution.

This part cross-references ATP 101377 for the same application.

What It Helps Repair

• Exhaust leaks at the manifold-to-cylinder head sealing surface
• Broken or warped manifold issues from heat cycling
• Noise from cracked or leaking exhaust manifold assemblies
• Failed flange or gasket sealing at the downpipe connection
• Corrosion-related replacement needs on older truck and SUV exhaust systems

Installation Notes and Tips

Verify left-side fitment and confirm the vehicle is equipped without A.I.R. before installation. Inspect the cylinder head surface, fasteners, and exhaust connection points for damage or corrosion, and replace worn sealing surfaces as needed. Use the included gasket, flange, and mounting hardware during assembly, and follow factory torque specifications for proper sealing.

Quality Assurance

Dorman manufactures this manifold to match original fit and function on the listed applications. The cast iron design, included heat shield, and complete hardware package support a repair that follows OE-style service requirements.