Dorman 674-656 Exhaust Manifold - Rear

Overview of Dorman 674-656 Exhaust Manifold

The Dorman 674-656 exhaust manifold is designed for reliable performance and durability in select Buick, Oldsmobile, and Pontiac vehicles. Constructed from stainless steel with a natural finish, this exhaust manifold offers a solid replacement option for models such as the Buick LeSabre, Oldsmobile 88, and Pontiac Bonneville.

• Made from durable stainless steel material
• Natural color finish for corrosion resistance
• Round port shape for optimal exhaust flow
• Includes mounting hardware for straightforward installation
• Comes with exhaust and flange gaskets to ensure a proper seal
• Heat shield included to protect surrounding components
• Compatible with Buick, Oldsmobile, and Pontiac models including 88, 98, Bonneville, LeSabre, Park Avenue, Reatta, Riviera, and Toronado

Detailed Product Description

This Dorman exhaust manifold (part number 674-656) is engineered with stainless steel to resist rust and withstand high temperatures typical of exhaust systems. The natural finish helps maintain the integrity of the manifold over time. Featuring a round port shape, it is designed to match the original equipment specifications for a proper fit and efficient exhaust gas flow. The package includes all necessary mounting hardware, such as two studs, along with an exhaust manifold gasket and a flange gasket to ensure a secure and leak-free installation. Additionally, the included heat shield helps protect adjacent engine components from excessive heat exposure.

Compatible Vehicles and Applications

This exhaust manifold is compatible with a range of Buick, Oldsmobile, and Pontiac vehicles, including:

• Buick LeSabre and Park Avenue
• Oldsmobile 88 and 98
• Pontiac Bonneville, Reatta, Riviera, and Toronado

It is designed to meet the specific exhaust routing and mounting requirements of these models, making it a suitable replacement part for maintenance or repair.

Common Issues Addressed by This Exhaust Manifold

• Exhaust leaks caused by cracked or warped manifolds
• Corrosion damage from rusted original manifolds
• Reduced engine performance due to exhaust flow restrictions
• Excessive engine bay heat without proper shielding
• Failed gaskets leading to exhaust noise and emissions problems

Installation Notes and Tips

Installation of the Dorman 674-656 exhaust manifold should be performed with care to ensure proper sealing and fitment. It is recommended to:

• Use the included gaskets and mounting hardware to prevent leaks
• Inspect the exhaust ports and clean mating surfaces before installation
• Torque mounting bolts to manufacturer specifications
• Check heat shield placement to avoid contact with wiring or hoses
• Verify compatibility with your specific vehicle model and engine configuration

Quality Assurance and Warranty

Dorman manufactures this exhaust manifold to meet regular grade standards, ensuring consistent quality and durability. The part number 674-656 undergoes quality checks to comply with OEM fit and function requirements. This product includes a limited warranty covering defects in materials and workmanship, providing confidence in its long-term reliability when installed correctly.