Dorman 674-158 Exhaust Manifold - Right

Durable Cast Iron Exhaust Manifold for Chevrolet and GMC Vehicles

The Dorman 674-158 exhaust manifold is engineered to provide reliable exhaust flow for select Chevrolet and GMC trucks and SUVs. Constructed from cast iron with a natural finish, this exhaust manifold is designed to withstand high temperatures and deliver consistent performance.

• Material: Heavy-duty cast iron for durability and heat resistance
• Color: Natural cast iron finish
• Port Shape: Square ports for optimal exhaust flow
• Includes mounting hardware for straightforward installation
• Comes with exhaust manifold gasket and flange gasket
• Heat shield included to protect surrounding components
• Grade Type: Regular, suitable for standard replacement needs

Product Details and Compatibility

The Dorman 674-158 exhaust manifold is compatible with a range of Chevrolet and GMC models, including Blazer, Jimmy, R10, R20, R30, R1500, R2500, R3500, V10, V20, and V30 series trucks and SUVs, along with their Suburban variants. This part is designed to replace the original exhaust manifold, ensuring proper fit and function. The square port shape helps maintain efficient exhaust gas flow, reducing backpressure and supporting engine performance.

Common Applications and Problem Resolution

• Replacement for cracked or warped exhaust manifolds causing exhaust leaks
• Fixes manifold gasket failures that lead to exhaust noise or fumes entering the cabin
• Addresses heat shield damage that can cause heat-related component wear
• Restores proper exhaust flow to improve engine efficiency and emissions
• Resolves mounting hardware corrosion or loss issues

Installation Notes and Tips

Installation of the Dorman 674-158 exhaust manifold includes all necessary mounting hardware, gaskets, and heat shield for a complete replacement. It is recommended to clean the mounting surfaces thoroughly before installation to ensure a proper seal. Torque specifications should be followed according to the vehicle manufacturer’s guidelines to prevent leaks or damage. This part is designed for professional or experienced DIY installation.

Quality Assurance and Warranty Information

Dorman exhaust manifolds are manufactured to meet or exceed OEM standards for fit, form, and function. The 674-158 part number undergoes rigorous quality control to ensure durability and performance. This product includes a limited warranty covering defects in materials and workmanship, providing confidence in its long-term reliability for Chevrolet and GMC vehicles.