Dorman 674-777 Exhaust Manifold

Dorman 674-777 Exhaust Manifold

Dorman 674-777 is a cast iron exhaust manifold engineered to match the fit and function of the original manifold on specified vehicles. It includes the gasket, flange, studs, nuts, and heat shield needed for a complete exhaust manifold repair on compatible applications.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with an oval port shape
• Includes gasket or seal, mounting hardware, and heat shield
• Direct replacement design for OE-style fit and function
• Package contents include the manifold, manifold gasket, flange, studs, and nuts

Detailed Description

This exhaust manifold is built for vehicles that need a replacement manifold with the correct shape, mounting points, and sealing surfaces. Dorman 674-777 is a practical choice for 2002-2005 Chevrolet Trailblazer, 2002-2005 GMC Envoy, and related applications where the original manifold has cracked, warped, or developed an exhaust leak. It also cross-references ATP 101403 for the same application.

Compatible With 2004-2005 Buick Rainier, 2002-2005 Chevrolet Trailblazer and Trailblazer EXT, 2002-2005 GMC Envoy and Envoy XL, 2004-2005 GMC Envoy XUV, 2003-2005 Isuzu Ascender, 2005 Saab 9-7x, and 2002-2004 Oldsmobile Bravada. The part number 674-777 is associated with these fitments and is built to restore proper exhaust routing at the manifold location.

What It Helps Repair

• Exhaust leaks at the manifold sealing surface
• Cracked or heat-damaged original manifold housings
• Broken or missing manifold mounting hardware
• Noise from escaping exhaust gases near the engine
• Fitment issues caused by a worn or distorted OE manifold

Installation Notes and Tips

Verify engine and vehicle application before installation, since fitment is specific to listed models and years. Inspect the cylinder head sealing surface, flange alignment, and downpipe connection before assembly. Use the included gasket, flange, studs, and nuts during installation, and confirm the heat shield is positioned correctly to help manage exhaust heat near surrounding components.

Quality Assurance

Dorman manufactures this manifold to match the original part’s fit and function on specified vehicles. The cast iron construction and included sealing and mounting components support a complete repair using OE-style dimensions and hardware.