Dorman 550-028 Engine Expansion Plug
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Dorman

Dorman 550-028 Engine Expansion Plug

Brand Dorman 550-028
Describe Type Concave
Material Steel
Maximum Diameter 2
Minimum Diameter 2
Package Contents 10 Expansion Plugs
Fits Chevrolet and GMC

OE direct replacement. Matches the fit and function of the original engine expansion plug.

Steel construction. Built from quality material for reliable performance.

Concave design. Provides a secure, precise seal in the engine block.

Cross-references 63556R1, 3835121 and EP-26 for the same application. See all 3.

$28.56Free shipping
In stock · usually ships same day before 1pm CST
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Dorman 550-028 Engine Expansion Plug

Dorman 550-028 is a steel engine expansion plug built to match the fit and function of the original core plug on specified vehicles. Its concave design and 2-inch diameter help provide a precise service replacement for engine block sealing needs.

Key Features

  • Steel construction for engine hardware service
  • Concave plug profile for OE-style fit
  • 2-inch maximum diameter and 2-inch minimum diameter
  • Direct replacement engine core plug for specified applications
  • Engineered to match original part dimensions and function

Detailed Description

This Dorman engine expansion plug is used in engine block repair and maintenance where a worn, damaged, or leaking core plug needs replacement. The steel construction supports dependable sealing performance, while the concave shape follows the original-style design used in many engine applications. For buyers searching for a Dorman 550-028 engine core plug or a steel expansion plug for engine service, this part provides a straightforward OE-style solution. It is also a relevant replacement choice for select Ford Mustang and Chevrolet Camaro applications where the original plug specification calls for a 2-inch concave design.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Fix

  • Coolant leakage from a failed engine core plug
  • Corrosion-related damage in the engine block plug area
  • Improper sealing after prior plug removal
  • Service issues caused by a cracked or deformed expansion plug
  • Replacement needs during engine rebuild or cooling system repair

Installation Notes and Tips

Verify the engine block opening measures 2 inches before installation. Clean the bore thoroughly and inspect for pitting, rust, or distortion that could affect sealing. Because fitment is application-specific, confirm the vehicle and engine requirements before ordering. For search relevance, this part is commonly referenced for Ford Mustang and Chevrolet Camaro engine repair, and the Dorman 550-028 designation should be matched to the original plug size and style.

Quality Assurance

Made by Dorman using quality materials and engineered to match original part fit and function on specified vehicles.

This part fits 0 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
63556R13835121EP-26