Dorman 674-860 Exhaust Manifold - Left

Dorman 674-860 Exhaust Manifold for Left Side Repair

This Dorman exhaust manifold is built for direct replacement on select Chevrolet P30 and GMC P3500 applications. It is precision-engineered to match the original fit and function, with cast iron construction and the necessary gaskets and downpipe hardware for a complete exhaust repair.

Key Features

• Direct replacement exhaust manifold for the left side
• Cast iron construction for durable exhaust service
• Rectangle port shape for OE-style fitment
• Includes gasket and seal components for the repair
• Mounting hardware included for installation
• Natural finish
• Part number: 674-860

Detailed Description

Dorman 674-860 is an exhaust manifold designed for select 1996-1999 Chevrolet P30 and 1996-1999 GMC P3500 vehicles in the left position. It is manufactured to match the original manifold’s fit and function, helping restore proper exhaust routing on the affected side. The cast iron body supports long-term exhaust service, while the rectangle port shape and OE-style layout help maintain correct alignment during replacement. This part number, 674-860, is a practical choice when replacing a cracked, warped, or leaking manifold on these applications.

This part cross-references ATP 101475 for the same application.

What This Part Helps Fix

• Exhaust leaks at the manifold
• Cracks or warping in the original manifold
• Noisy exhaust operation from a failing seal surface
• Downpipe connection issues at the flange area
• Loss of proper exhaust flow on the left side

Installation Notes and Tips

Compatible with 1996-1999 Chevrolet P30, left, and 1996-1999 GMC P3500, left. Verify the port shape, mounting points, and left-side application before installation. Inspect the mating surfaces, studs, nuts, and flange area for wear or damage, and replace any compromised components during service. Use the included gaskets and downpipe hardware to complete the repair and help ensure a proper seal.

Quality Assurance

This Dorman manifold is engineered and manufactured to match original fit and function on the specified vehicles. It is built as a regular-grade replacement part for exhaust system repair on Chevrolet P30 and GMC P3500 applications.