Dorman 674-523 Exhaust Manifold - Left

Exhaust Manifold for GM 4.8L/5.3L Applications

This Dorman exhaust manifold is engineered to match the original fit and function on specified Chevrolet and GMC vehicles. Built from cast iron with a natural finish, it includes the gaskets, heat shield, and downpipe hardware needed for a complete left-side exhaust repair.

Compatible with Chevrolet Silverado 1500, Chevrolet Express 1500, GMC Sierra 1500, and GMC Savana 1500 applications, this Dorman 674-523 is a direct replacement for the factory manifold on the listed vehicles.

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Includes heat shield, gaskets, and mounting hardware
• Designed to match original fit and function
• Left-side exhaust manifold for listed GM trucks and vans

Fitment Details

• Fits 2003-2014 Chevrolet Express 1500, left.
• Fits 2003-2014 GMC Savana 1500, left.
• Fits 2002-2013 Chevrolet Silverado 1500, left.
• Fits 2002-2013 GMC Sierra 1500, left.
• Fits 2007 Chevrolet Silverado 1500 Classic, left.
• Fits 2007 GMC Sierra 1500 Classic, left.
• Fits 2003-2005 Chevrolet Express 2500, left.
• Fits 2003-2005 GMC Savana 2500, left.

What This Part Helps Repair

• Exhaust leaks at the manifold flange or gasket surface
• Cracked or warped original manifold housing
• Broken or corroded manifold studs and nuts
• Heat-related noise from a failing left exhaust manifold
• Downpipe connection issues on the listed GM applications

Installation Notes

Verify engine configuration and left-side placement before installation. Inspect the cylinder head and exhaust flange surfaces for damage, and replace any worn fasteners or sealing surfaces as needed. This part number 674-523 includes the manifold gaskets, flange gasket, studs, nuts, and heat shield specified for the repair.

This part cross-references ATP 101552 for the same application.

Quality Assurance

Dorman manufactures this exhaust manifold to match the fit and function of the original equipment part on the listed Chevrolet and GMC vehicles. Part number 674-523 is built for regular-duty replacement service and is supported by Dorman’s OE-style engineering approach.