Dorman Autograde Steel Cup Engine Expansion Plug 1-15/16 In for Buick Roadmaster Special Super 555-040

Steel cup engine expansion plug for 1950-1953 Buick Roadmaster Special and Super models used to replace worn or leaking factory core plugs.

Built to meet the manufacturer's design intent for reliable service using quality steel materials engineered for durable performance in demanding engine environments.

Key Features

• Constructed from durable steel for long-lasting reliability
• Precise diameter of 1-15/16 inches with 0.530 inch height
• Direct replacement for original equipment specifications
• Validated through testing to ensure proper fit and function
• Compatible with General Motors part number 1339404
• Sold as a 10-piece pack for multiple replacements

Benefits

• Restores engine sealing to prevent coolant or oil leaks
• Reduces the risk of repeat repairs with robust construction
• Ensures smoother installation with OE-matching dimensions
• Helps maintain proper engine operating temperatures
• Provides cost-effective solution compared to dealer parts
• Backed by over a century of automotive expertise

Application

Ideal for classic car restorations and maintenance on vintage Buick vehicles requiring precise engine block sealing components.

Fitment Notes

• Fits 1950-1952 Buick Super
• Fits 1951-1953 Buick Special
• Fits 1951-1952 Buick Roadmaster
• Verify engine block measurements 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
• Supported by a team of product experts in the United States

What's in the Box

• 10 Piece set of steel cup expansion plugs

Item Dimensions

• Package Length: 4.9 inches
• Package Width: 3.7 inches
• Package Height: 2.2 inches
• Weight: 0.9 lbs