Dorman 674-158 Exhaust Manifold - Right

OE-Style Exhaust Manifold for Right Side Repair

Dorman 674-158 is a cast iron exhaust manifold built to match the fit and function of the original manifold on specified vehicles. It is engineered for the right side and includes the gaskets, flange hardware, and heat shield needed for a complete exhaust manifold repair on select Chevrolet and GMC trucks and SUVs.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish with square port shape
• Right-side application for specified Chevrolet Blazer, GMC Jimmy, and related models
• Includes manifold gasket, flange gasket, studs, nuts, springs, and heat shield
• Direct replacement design for OE-style fit and function
• Cross-references ATP 101062 and SKP SK674158 for the same application

Detailed Description

This Dorman exhaust manifold, part number 674-158, is precision-engineered to replace the original manifold on select 1987-1991 Chevrolet and GMC vehicles. The cast iron body is built for exhaust heat and long-term service, while the square port layout supports proper alignment on the right side. It is a practical replacement for vehicles such as the Chevrolet Blazer, GMC Jimmy, and related R/V-series trucks and Suburban models that use the specified right-side manifold configuration.

Part number 674-158 is supplied with the manifold gasket, flange gasket, studs, nuts, springs, and heat shield, helping support a complete repair at the manifold-to-downpipe connection. For buyers searching for a right exhaust manifold for 1987-1991 Chevrolet Blazer, right exhaust manifold for 1987-1991 GMC Jimmy, or Dorman 674-158 exhaust manifold replacement, this listing matches the confirmed application data.

Common Problems This Part Can Address

• Exhaust leaks at the manifold or flange connection
• Cracked or warped original manifold casting
• Broken or corroded manifold mounting hardware
• Noise from escaping exhaust gases on the right side
• Failed gasket sealing at the manifold-to-downpipe joint

Installation Notes and Tips

Verify the vehicle’s right-side manifold configuration before ordering. Inspect the cylinder head sealing surface, flange area, and fasteners for damage or corrosion during removal. Replace worn mating surfaces as needed and follow the vehicle service procedure for torque sequence and heat shield placement. Confirm fitment against the listed applications for Chevrolet and GMC models before installation.

Quality Assurance

Dorman manufactures this manifold to match the fit and function of the original part on specified vehicles. The design focuses on OE-style replacement dimensions and included sealing components for a complete repair on confirmed applications.