Dorman 674-858 Exhaust Manifold - Right

Dorman 674-858 Exhaust Manifold

Dorman 674-858 is a cast iron exhaust manifold built to match the fit and function of the original manifold on specified vehicles. It includes the manifold gasket, heat shield, and downpipe hardware needed for a complete exhaust manifold repair.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with round port shape
• Includes gasket and heat shield
• Package contents: exhaust manifold, 1 manifold gasket, 3 studs, and 3 nuts
• Precision-engineered replacement for OE-style fitment
• Cross-references OE part numbers 101470 and 12570670 for the same application

Detailed Description

This Dorman exhaust manifold, part number 674-858, is engineered as a direct replacement for the original manifold on specified vehicles. The cast iron body helps maintain structural integrity under high exhaust temperatures, while the round port design supports proper exhaust flow at the cylinder head. For buyers searching for a replacement exhaust manifold for Chevrolet and GMC applications, 674-858 provides the core components needed to restore a leaking, cracked, or warped manifold assembly.

Because this manifold includes the gasket, heat shield, and downpipe hardware, it supports a more complete repair on vehicles that need an OE-style exhaust manifold replacement. If you are sourcing a Dorman 674-858 exhaust manifold for Chevrolet or GMC repair work, this part is built around the original fit and function requirements of the application.

What It Helps Repair

• Exhaust leaks at the manifold-to-cylinder-head sealing surface
• Cracked or warped cast manifold housings
• Broken or missing manifold mounting hardware
• Noise from a leaking exhaust manifold assembly
• Heat-related damage around the manifold area

Installation Notes and Tips

Verify the manifold port shape, mounting points, and engine-side layout before installation. Clean the cylinder-head sealing surface thoroughly and replace any damaged fasteners or mating components as needed. Follow factory torque specifications and tighten hardware in the recommended sequence to help prevent sealing issues after installation.

Quality Assurance

Dorman manufactures this manifold to match original fit and function on specified vehicles. The part number 674-858 is built for regular-duty service and is supplied with the gasket and heat shield called out in the product specifications.