Dorman Autograde Steel Cup Engine Expansion Plug 42.3mm for General Motors 1982-2003 555-110

Steel cup engine expansion plug 42.3mm for General Motors vehicles from 1982 to 2003 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 durable steel to withstand engine pressures and prevent coolant leaks.

Key Features

• Constructed from high-quality steel for long-lasting durability
• Precise 42.3mm diameter with 0.500 inch height
• Designed to match original equipment form and function
• Direct replacement for specific General Motors engine blocks
• Validated through testing to ensure proper seal
• Sold as a 10-piece pack for multiple replacements

Benefits

• Stops coolant leaks caused by corroded or failed expansion plugs
• Restores engine cooling system integrity and pressure
• Prevents overheating issues related to coolant loss
• Reduces risk of repeat repairs with robust material construction
• Ensures a secure fit that matches factory specifications
• Cost-effective solution for maintaining engine health

Application

Ideal for mechanics and DIY enthusiasts repairing cooling system leaks on older General Motors trucks and cars requiring a 42.3mm core plug replacement.

Fitment Notes

• Compatible with select General Motors models from years 1982 to 2003
• Replaces General Motors part numbers 14079547 and 12337839
• Cross-references with Pioneer part numbers EPC272-25 and EPC-272

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
• Helps reduce the risk of repeat repairs for a smarter restoration

What's in the Box

• 10 pieces of Steel Cup Expansion Plugs

Item Dimensions

• Package measures 4.9 inches by 3.7 inches by 2.2 inches
• Total package weight is 0.7 lbs