Dorman Autograde Rubber Engine Expansion Plug 1-3/8 Inch for 1955-1959 GMC and 1955-1957 Pontiac 570-008

Rubber engine expansion plug 1-3/8 inch for 1955-1959 GMC and 1955-1957 Pontiac used to replace worn or leaking factory core plugs.

Built to meet the manufacturer's design intent for reliable service, this plug is constructed from quality rubber materials engineered to resist deterioration and maintain a secure seal within the engine block.

Key Features

• Direct replacement for original equipment expansion plugs
• Constructed from durable rubber for long-lasting performance
• Size range covers 1-3/8 inch to 1-1/2 inch applications
• Engineered to match OE form, fit, and function
• Validated through testing to ensure dependable operation

Benefits

• Restores engine integrity by sealing coolant leaks effectively
• Prevents costly engine damage caused by fluid loss
• Reduces the risk of repeat repairs with quality materials
• Ensures a smoother installation process with precise sizing
• Helps maintain proper engine operating temperature

Application

Ideal for classic car restorations and maintenance on vintage GMC trucks and Pontiac vehicles requiring a trustworthy seal for the cooling system.

Fitment Notes

• Compatible with 1955-1959 GMC models
• Compatible with 1955-1957 Pontiac models
• Replaces Pioneer part number EZ-137

Why Choose Dorman - Autograde?

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

What's in the Box

• 5 Piece Set of Rubber Expansion Plugs

Item Dimensions

• 6.2 inches x 4.7 inches x 2.8 inches
• Weight: 0.9 lbs