Dorman Products

Dorman 555-020 Expansion Plug - Engine Cylinder Head

In stock
SKU: 591|555020
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Not sure it fits? Message Year/Make/Model/Engine (2WD/4WD if applicable) and we’ll help confirm compatibility.
Why buy from Koskowski Automotive?
• 50+ years (since 1972) • Dorman Authorized Seller • Fast shipping • Easy returns
$18.35
Vehicle Fitment: Use the table below to match your exact configuration. If you don’t see your exact setup, message us before ordering.

Product details

  • SKU 591|555020
  • Barcode 19495555209

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Description

Product Description

This engine cylinder head plug is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.

  • Direct replacement - this engine cylinder head plug matches the fit and function of the factory part on specified years, makes and models
  • Ideal solution - this plug is a reliable replacement for an original part that is missing or has failed due to fatigue
  • Durable construction - this part is made from quality materials to ensure reliable performance and long service life
  • Trustworthy quality - backed by team of product experts in the United States and more than a century of automotive experience

Detailed Applications

Year Make Model Configuration Positions Application Notes
1988 Buick Century V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Buick Electra 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Buick LeSabre V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Buick Reatta 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Buick Riviera 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Oldsmobile 98 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Oldsmobile Cutlass Ciera V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Oldsmobile Cutlass Cruiser V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Oldsmobile Delta 88 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Oldsmobile Toronado 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1988 Pontiac Bonneville V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Buick Century V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Buick Electra V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Buick LeSabre V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Buick Regal V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Buick Riviera 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile 98 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile Cutlass Ciera V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile Cutlass Cruiser V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile Cutlass Salon V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile Cutlass Supreme V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile Delta 88 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Oldsmobile Toronado 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Pontiac Bonneville V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1987 Pontiac Grand Prix V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Buick Century V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Buick Electra V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Buick LeSabre V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Buick Regal V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Buick Riviera 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Oldsmobile 98 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Oldsmobile Cutlass Ciera V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Oldsmobile Cutlass Salon V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Oldsmobile Cutlass Supreme V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Oldsmobile Delta 88 V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Oldsmobile Toronado 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Pontiac Bonneville V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1986 Pontiac Grand Prix V6 231 3.8L (3800cc) 4 Required; wo/Balance Shaft; 1.125 In. Shallow Cup
1985 Buick Century V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Buick Electra V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Buick LeSabre V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Buick Regal V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Buick Riviera V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Oldsmobile 98 V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Oldsmobile Cutlass Ciera V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Oldsmobile Cutlass Salon V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Oldsmobile Cutlass Supreme V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Oldsmobile Delta 88 V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Pontiac Bonneville V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
1985 Pontiac Grand Prix V6 231 3.8L (3800cc) 4 Required; 1.125 In. Shallow Cup
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Product Specifications

Closed End Diameter: 1.12 in
Material: Steel
Open End Diameter (in): 1.135 in
Package Contents: Cup Type Plug
Packaging Type: Box
Package Quantity: 10
Brand: Dorman - AutoGrade - Boxed