Dorman Autograde Steel Cup Engine Expansion Plug 2-1/4 In for Buick Oldsmobile Pontiac 555-052

Steel cup engine expansion plug 2-1/4 inch diameter for 1953-1967 Buick 1961-1963 Oldsmobile and 1961-1962 Pontiac used to replace leaking or corroded factory freeze plugs.

Built to meet the manufacturer's design intent for reliable service using quality steel materials engineered to match original equipment specifications for a secure seal.

Key Features

• Constructed from durable steel for long-lasting corrosion resistance
• Precise 2-1/4 inch outer diameter with 0.565 inch height
• Direct replacement for General Motors part number 1343487
• Matches OE form fit and function for specified vintage vehicles
• Validated by product experts with over a century of automotive experience

Benefits

• Stops coolant leaks caused by worn or damaged factory plugs
• Prevents engine overheating and potential block damage
• Ensures a tight seal to maintain proper cooling system pressure
• Reduces the risk of repeat repairs with trustworthy materials
• Restores vehicle reliability with a smart aftermarket solution

Application

Ideal for classic car restorations and maintenance on mid-century American vehicles requiring a dependable freeze plug replacement to keep the cooling system intact.

Fitment Notes

• Compatible with Buick models from 1953 to 1967
• Compatible with Oldsmobile models from 1961 to 1963
• Compatible with Pontiac models from 1961 to 1962
• Verify engine block requirements before installation

Why Choose Dorman - Autograde?

• Dorman parts are engineered as direct-fit replacements designed to match OE form fit and function
• Built with quality materials and validated through testing to stand up to daily driving demands
• Backed by a team of product experts in the United States

What's in the Box

• 10 PC Engine Expansion Plugs

Item Dimensions

• 5.5in x 4.0in x 2.3in 1.4lbs