Dorman 674-522 Exhaust Manifold - Left

Dorman 674-522 Left Exhaust Manifold

Dorman 674-522 is a left exhaust manifold replacement for a wide range of Chevrolet, GMC, Cadillac, and Hummer applications. It uses high-grade ductile iron construction to better manage heat and stress than lower-grade OE castings, helping address common manifold cracking and warping concerns.

Key Features

• OE FIX replacement exhaust manifold for the left side
• High-grade ductile iron construction for improved heat and stress resistance
• Natural finish with round port shape
• Includes gasket/seal components and heat shield
• Mounting hardware included for installation
• Direct replacement for applications such as Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade

Detailed Description

This Dorman exhaust manifold is built for drivers replacing a cracked or warped left-side manifold on GM trucks and SUVs. Part number 674-522 is engineered as an OE-style solution for vehicles including Chevrolet Silverado 2500 HD, GMC Sierra 3500 HD, Chevrolet Tahoe, GMC Yukon, and related Express and Savana vans. The cast iron construction, round port design, and included heat shield support a factory-style repair where exhaust sealing and thermal durability matter.

This part cross-references ATP 101261 for the same application.

Common Problems It Can Help Address

• Exhaust leaks from a cracked manifold
• Ticking or puffing noises at cold start
• Warped flange surfaces that affect sealing
• Broken or corroded manifold mounting points
• Heat-related deterioration on the left exhaust side

Installation Notes and Tips

• Fits the left position only.
• Review vehicle-specific notes before ordering, including applications listed as wo/Air Pump or wo/Ceramic Coating.
• Inspect the cylinder head flange, studs, and gasket surfaces before installation.
• Use the included gasket and hardware where specified for a complete repair.
• Confirm fitment for your exact year, make, model, and engine configuration before installation.

Quality Assurance

Dorman OE FIX replacement parts are built to address common failure points found in original exhaust manifolds. Part number 674-522 uses a durable iron construction and application-specific fitment for confirmed GM truck, SUV, and van coverage.