Dorman 674-231 Exhaust Manifold - Left

Durable Cast Iron Exhaust Manifold for Chevrolet and GMC Vehicles

The Dorman 674-231 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 precise exhaust flow
• Mounting Hardware Included: Yes, includes studs and nuts for secure installation
• Gasket Included: Comes with a manifold gasket and flange for a proper seal
• Package Contents: Exhaust manifold, 1 manifold gasket and flange, 3 studs, and 3 nuts

Product Details and Specifications

This Dorman exhaust manifold (part number 674-231) is designed specifically for compatibility with Chevrolet and GMC models including Blazer, Jimmy, R10, R20, R30, and various Suburban and V-series trucks such as R1500, R2500, R3500, V10, V20, and V30. The cast iron construction ensures long-lasting durability under the demanding conditions of exhaust heat cycles. The square port shape optimizes exhaust gas flow, helping maintain engine efficiency and emissions control. Included mounting hardware and gasket simplify installation and help ensure a proper seal to prevent exhaust leaks.

Common Applications and Problem Solving

• Replaces cracked or warped exhaust manifolds causing exhaust leaks
• Restores proper exhaust flow to improve engine performance and reduce noise
• Eliminates exhaust manifold gasket leaks that can trigger check engine lights
• Addresses corrosion or rust damage common in older Chevrolet and GMC trucks
• Supports emissions compliance by maintaining exhaust system integrity

Installation Notes and Tips

Installation of the Dorman 674-231 exhaust manifold requires basic mechanical skills and tools. Ensure the engine is cool before beginning work. Use the included gasket and mounting hardware to secure the manifold tightly to the cylinder head. Torque all fasteners to manufacturer specifications to prevent leaks. Inspect the exhaust ports and clean mating surfaces before installation for optimal sealing. This manifold does not include a heat shield, so verify compatibility with your vehicle’s existing components.

Quality Assurance and Warranty

Dorman exhaust manifolds are manufactured to meet or exceed OEM standards for fit, form, and function. The 674-231 part is backed by Dorman’s quality control processes to ensure durability and performance. This product includes a limited warranty against defects in materials and workmanship, providing confidence in your replacement part.