Dorman 674-446 Exhaust Manifold - Right

Dorman 674-446 Exhaust Manifold

This Dorman OE FIX exhaust manifold is built for the right side of select Chevrolet and GMC vans and trucks with a direct-fit replacement design. It uses high-grade ductile iron construction to better manage heat and stress than lower-grade original manifolds that can warp or crack.

Compatible with 1996-2002 Chevrolet Express 1500, right; 1996-2002 Chevrolet Express 2500, right; 1996-1999 Chevrolet Express 3500, right; 1996-1999 Chevrolet P30, right; 1996-2002 GMC Savana 1500, right; 1996-2002 GMC Savana 2500, right; 1996-2002 GMC Savana 3500, right; and 1996-1999 GMC P3500, right. This part number is 674-446.

Key Features

• High-grade ductile iron construction for improved heat and stress resistance
• Direct replacement exhaust manifold for the right side
• Natural cast iron finish
• Square port shape
• Mounting hardware included
• Manifold gasket and flange gasket included
• Designed for select Chevrolet Express and GMC Savana applications

Detailed Description

Dorman 674-446 is an OE FIX replacement exhaust manifold engineered to address a common failure point in original manifolds that can warp or crack over time. The cast iron construction is intended to provide stronger long-term durability in high-heat exhaust service, while the included gaskets support a proper seal at installation. This part number 674-446 is a direct-fit solution for right-side applications on Chevrolet Express, Chevrolet P30, GMC Savana, and GMC P3500 models listed in the fitment data.

This part cross-references ATP 101168 and SKP SK674446 for the same application.

Common Problems This Part Can Address

• Cracked exhaust manifold on the right side
• Warped manifold flange causing exhaust leaks
• Ticking or puffing noise from a leaking manifold
• Exhaust odor entering the engine bay
• Failed sealing surface at the manifold-to-head connection

Installation Notes and Tips

Install on the right side only for the listed applications. Inspect the cylinder head sealing surface, studs, and fasteners before installation, and replace any damaged components as needed. Use the included manifold gasket and flange gasket to help achieve a proper seal, and verify port shape and fitment before final tightening.

Quality Assurance

Dorman positions this OE FIX manifold as an upgraded replacement for original manifolds that are prone to heat-related warping and cracking. The design focuses on durability and fit for the specified Chevrolet and GMC applications.