Dorman 555-120 Engine Cylinder Head Plug

Reliable Steel Engine Cylinder Head Plugs

The Dorman 555-120 engine cylinder head plugs are designed to provide a secure seal for your engine block. Made from durable steel, these plugs ensure long-lasting performance and resistance to engine heat and pressure.

• Constructed from high-quality steel for durability
• Closed end diameter of 0.666 inches for precise fit
• Open end diameter of 0.666 inches for consistent sealing
• Package includes 10 steel expansion plugs for multiple repairs

Durable Steel Construction for Engine Integrity

These engine cylinder head plugs by Dorman are engineered to maintain the integrity of your engine block by sealing coolant and oil passages effectively. The uniform 0.666 inch diameter on both closed and open ends ensures a tight fit, reducing the risk of leaks. Ideal for vehicles requiring reliable expansion plugs, the Dorman 555-120 plugs are suitable for various automotive applications, including many Ford and Chevrolet models where steel expansion plugs are specified.

Common Applications and Problem Solving

• Sealing coolant passages to prevent leaks and overheating
• Replacing worn or corroded cylinder head plugs
• Maintaining engine block pressure and fluid containment
• Preventing contamination of engine oil and coolant systems
• Supporting engine rebuilds and maintenance tasks

Installation Notes and Tips

When installing the Dorman 555-120 engine cylinder head plugs, ensure the engine block surface is clean and free of debris. Use the correct size driver to avoid damaging the plug or engine block. Gently tap the plug into place until it is flush with the block surface. Avoid over-driving to prevent deformation or leaks.

Quality Assurance and Warranty

Dorman manufactures the 555-120 engine cylinder head plugs to meet or exceed OEM specifications. Each plug is made from steel to provide reliable performance under engine operating conditions. While specific warranty details are not provided, Dorman products typically come with a limited warranty against defects in material and workmanship.