Dorman 674-729 Exhaust Manifold - Left

Durable Cast Iron Exhaust Manifold for Chevrolet and GMC Trucks

The Dorman 674-729 exhaust manifold is engineered to provide reliable exhaust flow for heavy-duty Chevrolet and GMC trucks. Designed with a natural cast iron finish and square port shape, this manifold ensures a precise fit and long-lasting performance for models like the Silverado 2500 HD and Sierra 3500 Classic.

Key Features of the Dorman 674-729 Exhaust Manifold

• Constructed from durable cast iron for strength and heat resistance
• Natural color finish maintains original equipment appearance
• Square port shape designed for optimal exhaust flow and sealing
• Includes exhaust manifold gasket, flange, studs, and nuts for installation
• Heat shield included to protect surrounding components from excessive heat
• Compatible with Chevrolet Avalanche 2500, GMC Sierra 2500 HD, and other 2500/3500 series trucks

Detailed Description

The Dorman 674-729 exhaust manifold is a direct replacement part crafted from cast iron, providing the necessary durability to withstand high exhaust temperatures and pressures. Its natural finish preserves the OEM look, while the square port design ensures a secure seal and efficient exhaust gas flow. This manifold comes complete with a gasket, flange, studs, nuts, and a heat shield to facilitate proper installation and protect adjacent engine components. It is specifically designed for heavy-duty Chevrolet and GMC trucks, including the Silverado 2500 HD Classic, Sierra 3500, and Yukon XL 2500, ensuring compatibility and reliable performance.

Common Applications and Issues Addressed

• Replacement for cracked or warped exhaust manifolds causing exhaust leaks
• Restores proper exhaust flow to improve engine efficiency and reduce emissions
• Eliminates exhaust manifold gasket leaks that can cause noise and performance loss
• Prevents heat damage to nearby engine parts with included heat shield
• Suitable for restoring exhaust system integrity on Chevrolet Avalanche 2500 and GMC Sierra 2500 HD trucks

Installation Notes and Tips

When installing the Dorman 674-729 exhaust manifold, ensure all old gasket material is thoroughly cleaned from the mounting surface to prevent leaks. Torque the mounting hardware evenly to manufacturer specifications to avoid warping the cast iron manifold. The included heat shield should be positioned correctly to protect wiring and hoses from heat exposure. This manifold is designed for direct bolt-on installation on compatible Chevrolet and GMC 2500 and 3500 series trucks.

Quality Assurance and Warranty

Dorman manufactures the 674-729 exhaust manifold to meet or exceed OEM standards for fit, form, and function. The cast iron construction and included heat shield contribute to the part’s durability under demanding operating conditions. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.