Dorman 615-621 Engine Intake Manifold - Center

Overview of Dorman Engine Intake Manifold 615-621

The Dorman 615-621 engine intake manifold is designed for reliable performance in Chevrolet and GMC heavy-duty trucks. Crafted from aluminum, this intake manifold offers durability and precise fitment for select Sierra and Silverado models.

• Constructed from lightweight aluminum material
• Compatible with Chevrolet and GMC Sierra 2500 HD, Sierra 3500, Sierra 3500 HD, Silverado 2500 HD, Silverado 3500, and Silverado 3500 HD
• Dimensions: 9 inches length, 5 inches width, and 9 inches manifold height
• Includes 2 mounting holes with 6.7 mm diameter for secure installation
• Single port outlet with 60 mm dimension
• Regular grade type, street legal for on-road use

Detailed Product Description

The Dorman 615-621 engine intake manifold is engineered to meet the specifications required by Chevrolet and GMC heavy-duty trucks, including the Sierra 2500 HD and Silverado 3500 HD series. Made from aluminum, this intake manifold balances strength and weight, contributing to efficient engine performance. Its dimensions—9 inches in length, 5 inches in width, and 9 inches in height—ensure proper fitment within the engine bay. The manifold features two mounting holes with a diameter of 6.7 mm, providing a secure and stable attachment. Designed with a single 60 mm port outlet, it supports optimal airflow to the engine cylinders. This intake manifold does not include a gasket or seal and is not equipped with mounts for air conditioning compressors or alternators. It is not EGR ready and does not have a heated choke port, aligning with the original equipment specifications for the compatible vehicles.

Common Applications and Problem Resolution

• Replacement for damaged or cracked intake manifolds in Chevrolet Sierra 2500 HD and Silverado 3500 HD trucks
• Restores proper air intake flow to improve engine efficiency and performance
• Addresses vacuum leaks caused by manifold wear or failure
• Helps resolve engine misfires related to intake manifold issues
• Supports maintenance of street-legal emissions standards

Installation Notes and Tips

Installation of the Dorman 615-621 intake manifold requires careful alignment of the two mounting holes and proper torque specifications to ensure a secure fit. Since this part does not include a gasket or seal, it is recommended to source the appropriate gasket separately to prevent air leaks. Verify compatibility with your specific Chevrolet or GMC model before installation. Professional installation is advised to maintain engine performance and avoid damage.

Quality Assurance and Warranty

Dorman manufactures this intake manifold to meet regular grade standards, ensuring consistent quality and durability. The part is street legal and designed to comply with OEM specifications for Chevrolet and GMC heavy-duty trucks. Warranty details should be confirmed with the distributor or manufacturer, as they may vary by region and purchase source.