Dorman 570-003 Engine Expansion Plug

Dorman 570-003 Engine Expansion Plug

Dorman 570-003 is an engine expansion plug built to match the fit and function of the original plug on specified vehicles. This 0.75-inch press-fit core plug uses a rubber construction with a brass finish for a direct replacement in engine block sealing applications.

Key Features

• Engine core plug for sealing engine block openings
• 0.75-inch maximum and minimum diameter for a precise fit
• Press-fit attachment type for OE-style installation
• Rubber construction with brass color finish
• Engineered to match original part fit and function
• Cross-references EZ-75 for the same application

Product Details

This Dorman engine expansion plug is designed for vehicles that require a 3/4-inch engine block plug, including Buick Century, Buick Skylark, Chevrolet Celebrity, Chevrolet Camaro, Chevrolet Citation, Chevrolet Citation II, Chevrolet Lumina, and Chevrolet Monza applications. The Dorman 570-003 is built for direct replacement use where a press-fit expansion plug is specified, helping restore proper sealing at the engine core plug location.

Compatible With 1982-1992 Buick Century, 1990-1992 Chevrolet Lumina, 1980-1991 Buick Skylark, 1982-1990 Chevrolet Celebrity, 1982-1986 Chevrolet Camaro, 1984-1985 Chevrolet Citation II, 1980-1983 Chevrolet Citation, and 1980 Chevrolet Monza. The part number 570-003 is commonly searched for engine expansion plug replacement on these Buick and Chevrolet models.

Common Repair Uses

• Replacing a leaking engine core plug
• Restoring sealing at a worn or damaged block opening
• Addressing coolant loss from a failed expansion plug
• Repairing corrosion-related plug deterioration
• Servicing engine block sealing during maintenance or rebuild work

Installation Notes and Tips

Verify the engine block opening size before installation and confirm the plug seats evenly in the bore. Clean the sealing surface thoroughly and inspect the surrounding area for corrosion or pitting that could affect the press fit. Use the vehicle service procedure for the correct installation method on the specified Buick and Chevrolet applications.

Quality Assurance

Dorman designs this engine expansion plug to match original part fit and function on listed vehicles. It is manufactured from quality materials for reliable performance in engine sealing service.