Dorman 674-656 Exhaust Manifold - Rear

OE-Style Exhaust Manifold Replacement

Dorman 674-656 is a stainless steel exhaust manifold engineered to match the fit and function of the original part on specified vehicles. It is built for the rear exhaust position and includes the gaskets and downpipe hardware needed for a complete repair.

• Stainless steel construction with a natural finish
• Round port shape for the specified application
• Includes gasket and seal components for installation
• Heat shield included
• Mounting hardware included
• Direct replacement for the rear exhaust manifold on select Buick, Oldsmobile, and Pontiac models

Detailed Product Overview

This exhaust manifold is designed for vehicles that need a replacement rear manifold with OE-style fit and function. Dorman 674-656 is a practical choice for a 1992 Buick LeSabre rear exhaust manifold replacement, as well as rear applications on the 1991-1992 Buick Park Avenue, 1991-1992 Buick Riviera, 1992 Oldsmobile 88, 1991-1992 Oldsmobile 98, 1991-1992 Oldsmobile Toronado, 1992 Pontiac Bonneville, and 1991 Buick Reatta. The stainless steel construction helps provide durable service in exhaust system environments, while the included heat shield and sealing components support a complete repair.

This part cross-references 101387 and 25537100 for the same application.

Common Repair Applications

• Cracked or leaking rear exhaust manifold
• Exhaust noise from the manifold area
• Failed manifold gasket sealing at the cylinder head or flange
• Corrosion-related replacement on older Buick, Oldsmobile, and Pontiac vehicles
• Broken or missing manifold mounting hardware during exhaust service

Installation Notes

Verify rear-position fitment before installation and compare the original manifold, port shape, and mounting points to the replacement part. Replace worn sealing surfaces as needed and follow factory torque specifications during assembly. The included gaskets and downpipe hardware support a more complete exhaust manifold repair on the listed vehicles.

Quality Assurance

Dorman manufactures this exhaust manifold to match the original fit and function on specified applications. Part number 674-656 is built as a regular-grade replacement for the listed rear exhaust manifold applications.