/live/media/RB/RB_555052_Fro.jpg)
Dorman 555-052 Engine Expansion Plug
| Brand | Dorman 555-052 |
|---|---|
| Describe Type | Cup Type |
| Material | Steel |
| Maximum Diameter | 2.264 |
| Minimum Diameter | 2.251 |
| Package Contents | Expansion Plug |
| Fits | Buick, Oldsmobile, and Pontiac · 33 vehicles |
OE direct replacement. Matches the fit and function of the original engine expansion plug.
Steel construction. Built from quality material for reliable performance.
Cup type design. Engine core plug for sealing engine block openings.
Cross-references 31580, 1343487 and EPC-81 for the same application. See all 3.
Dorman 555-052 Engine Expansion Plug
Dorman 555-052 is a steel cup-type engine expansion plug built to match the fit and function of the original engine core plug on specified Buick, Oldsmobile, and Pontiac applications. Its 2.251 to 2.264 diameter range supports a precise seal in the engine block opening.
Use this engine core plug when servicing classic GM engines that require a steel replacement plug with OE-style dimensions. The Dorman 555-052 is a direct-fit solution for restoration work and engine repair on select Buick Skylark, Buick LeSabre, Buick Riviera, Buick Century, Buick Roadmaster, Oldsmobile Cutlass, and Pontiac Tempest applications.
Key Features
- Steel construction for engine block sealing applications
- Cup-type expansion plug design
- Maximum diameter: 2.264
- Minimum diameter: 2.251
- Matches the fit and function of the original engine core plug
- Cross-reference part numbers include 31580 and EPC-81
Detailed Description
This Dorman engine expansion plug is engineered for specified vehicles where a steel cup-type core plug is required. It is used in engine hardware applications to close block openings and maintain proper sealing in the cooling system area. For restorations and repairs on 1950s and 1960s GM engines, part number 555-052 provides the correct style and dimensions for a dependable replacement.
Fits 1954 Buick Skylark, N/A. Fits 1959-1965 Buick LeSabre, N/A. Fits 1963-1965 Buick Riviera, N/A. Fits 1954-1958 Buick Century, N/A. Fits 1953-1958 Buick Roadmaster, N/A. Fits 1962-1963 Oldsmobile Cutlass, N/A. Fits 1961-1962 Pontiac Tempest, N/A. Fits 1964-1967 Buick Skylark, N/A.
This part cross-references 31580 and EPC-81 for the same application.
Common Uses
- Replacing a leaking or corroded engine core plug
- Restoring proper sealing in a rebuilt engine block
- Servicing classic Buick, Oldsmobile, and Pontiac cooling system openings
- Addressing engine block seepage around worn expansion plug bores
Installation Notes and Tips
Verify the block opening diameter before installation and confirm the plug’s cup-type profile matches the original part. Clean the bore thoroughly so the steel plug seats evenly, and follow the vehicle service procedure for proper installation depth and sealing.
Quality Assurance
Dorman designs this engine expansion plug to match original part fit and function on specified vehicles and manufactures it from quality materials for reliable performance.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1967 | Buick | Skylark | 4.9L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1966 | Buick | Skylark | 4.9L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1966 | Buick | Skylark | 6.6L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1965 | Buick | LeSabre | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1965 | Buick | Riviera | 6.6L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1965 | Buick | Skylark | 4.9L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1965 | Buick | Skylark | 6.6L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1964 | Buick | LeSabre | 4.9L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1964 | Buick | LeSabre | 6.6L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1964 | Buick | Riviera | 6.6L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1964 | Buick | Skylark | 4.9L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1963 | Buick | LeSabre | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1963 | Buick | Riviera | 6.6L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1963 | Oldsmobile | Cutlass | 3.5L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1962 | Buick | LeSabre | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1962 | Oldsmobile | Cutlass | 3.5L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1962 | Pontiac | Tempest | 3.5L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1961 | Buick | LeSabre | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1961 | Pontiac | Tempest | 3.5L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1960 | Buick | LeSabre | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1959 | Buick | LeSabre | 6.0L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1958 | Buick | Century | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1958 | Buick | Roadmaster | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1957 | Buick | Century | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1957 | Buick | Roadmaster | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1956 | Buick | Century | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1956 | Buick | Roadmaster | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1955 | Buick | Century | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1955 | Buick | Roadmaster | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1954 | Buick | Century | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1954 | Buick | Roadmaster | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1954 | Buick | Skylark | 5.3L | V8 | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| 1953 | Buick | Roadmaster | — | — | N/A | Steel; 4 Required, Package Quantity: 10, Boxed Packaging Type |
| No rows match your filter. | ||||||