Dorman 674-100 Exhaust Manifold

Exhaust Manifold for Select GM Trucks

This Dorman exhaust manifold is built for direct replacement on select Chevrolet and GMC applications. It is engineered to match the original fit and function, with stainless steel construction and the gaskets and downpipe hardware needed for a complete exhaust repair.

Key Features

• Direct replacement exhaust manifold for specified vehicles
• Stainless steel construction with a natural finish
• Square port shape for OE-style fitment
• Heat shield included
• Gaskets and seal included for the repair
• Mounting hardware included
• Package contents: exhaust manifold, 2 manifold gaskets, 1 flange gasket, 2 bolts, 2 nuts, and 2 springs

Detailed Description

Dorman 674-100 is a replacement exhaust manifold designed for 1985-1993 Chevrolet S10, 1985-1988 Chevrolet S10 Blazer, 1985-1990 GMC S15, and 1985-1988 GMC S15 Jimmy, as well as 1991-1993 GMC Sonoma applications. It is manufactured to match the original manifold’s fit and function, helping restore proper exhaust routing on these Chevrolet S10 and GMC S15 platform vehicles. This part cross-references ATP 101076 for the same application.

Common Repair Applications

• Cracked or warped exhaust manifold on a Chevrolet S10 or GMC Sonoma
• Exhaust leaks at the manifold-to-head sealing surface
• Broken or missing flange hardware at the downpipe connection
• Heat-related noise or ticking from the exhaust manifold area
• Replacement after corrosion or surface damage on the original manifold

Installation Notes and Tips

Verify engine and exhaust configuration before installation on your Chevrolet S10, GMC S15, or related application. Inspect the cylinder head sealing surface, downpipe flange, and fastener threads before assembly. Replace damaged studs or hardware as needed and follow the vehicle service procedure for torque sequence and final tightening.

Quality Assurance

Dorman manufactures this manifold as a direct-fit replacement part for specified vehicles, with materials and included sealing components selected to support a complete exhaust repair. Part number 674-100 is built to match OE-style fitment for the listed Chevrolet and GMC applications.