Dorman 555-110 Engine Expansion Plug

Brand	Dorman 555-110
Describe Type	Cup Type
Material	Steel
Maximum Diameter	0.167
Minimum Diameter	1.662
Package Contents	Expansion Plug
Fits	Chevrolet, GMC, Pontiac, Buick, Oldsmobile, and Cadillac · 109 vehicles

OE-style fit. Matches the original engine expansion plug's function.

Steel construction. Built from quality material for reliable performance.

Cup type design. A practical engine core plug for sealing openings.

Cross-references 12337839 and EPC-272 for the same application. See all 2.

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Dorman 555-110 Engine Core Plug

Dorman 555-110 is a steel cup-type engine expansion plug built to match the fit and function of the original plug on specified vehicles. It is engineered for reliable sealing in the engine block and is a direct replacement for common OE-style core plug applications.

Steel construction for durable engine-block sealing
Cup-type design for OE-style fit and function
Minimum diameter: 1.662 in.
Maximum diameter: 0.167 in.
Engine expansion plug for service and repair work

Fitment Coverage

Fits 1994-2003 Chevrolet S10, N/A
Fits 1983-1984 Chevrolet S10, N/A
Fits 1994-2003 GMC Sonoma, N/A
Fits 1992-2002 Chevrolet Cavalier, N/A
Fits 1982-1989 Chevrolet Cavalier, N/A
Fits 1995-2002 Pontiac Sunfire, N/A
Fits 1993-1996 Buick Century, N/A
Fits 1992-1996 Chevrolet Corsica, N/A
Fits 1987-1989 Chevrolet Corsica, N/A
Fits 1993-1996 Oldsmobile Cutlass Ciera, N/A
Fits 1993 Chevrolet Lumina, N/A
Fits 1982-1989 Buick Skyhawk, N/A
Fits 1982-1988 Oldsmobile Firenza, N/A
Fits 1982-1986 Cadillac Cimarron, N/A
Fits 1986 Pontiac Sunbird, N/A
Fits 1984-1985 Pontiac J2000 Sunbird, N/A
Fits 1983-1984 Chevrolet S10 Blazer, N/A
Fits 1983-1984 GMC S15, N/A
Fits 1983-1984 GMC S15 Jimmy, N/A
Fits 1982-1983 Pontiac J2000, N/A

Detailed Description

This engine core plug is designed for vehicles that use a cup-type expansion plug in the engine block. The steel construction supports a secure seal where coolant passages require a properly sized plug, and the part is shaped to match original equipment dimensions for the listed applications. It is a practical replacement for service on Chevrolet S10 and GMC Sonoma models, as well as Chevrolet Cavalier, Pontiac Sunfire, and other listed GM vehicles.

This part cross-references 12337839 and EPC-272 for the same application.

Common Repair Uses

Replacing a leaking or corroded engine expansion plug
Restoring coolant sealing at the engine block
Repairing rust-related seepage around a core plug bore
Addressing coolant loss from a worn cup-type plug
Servicing OE-style engine block sealing points on GM applications

Installation Notes

Verify the plug diameter and cup-type design against the engine block opening before installation. Clean the bore thoroughly so the sealing surface is free of corrosion, scale, and old sealant residue. Proper seating and correct sizing are important for a reliable seal on Chevrolet S10, GMC Sonoma, and other listed applications.

Quality Assurance

Dorman designs this expansion plug to match original part fit and function on specified vehicles. It is manufactured from quality materials for dependable engine repair service.

This part fits 109 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Liters	Cylinders	Position	Notes
2003	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2003	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2002	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2002	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2002	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2002	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2001	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2001	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2001	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2001	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2000	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2000	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2000	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
2000	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1999	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1999	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1999	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1999	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1998	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1998	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1998	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1998	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1997	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1997	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1997	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1997	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	Buick	Century	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	Chevrolet	Corsica	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	Oldsmobile	Cutlass Ciera	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	Buick	Century	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	Chevrolet	Corsica	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	Oldsmobile	Cutlass Ciera	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995	Pontiac	Sunfire	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994	Buick	Century	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994	Chevrolet	Corsica	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994	Chevrolet	S10	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994	GMC	Sonoma	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994	Oldsmobile	Cutlass Ciera	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993	Buick	Century	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993	Chevrolet	Corsica	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993	Chevrolet	Lumina	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993	Oldsmobile	Cutlass Ciera	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1992	Chevrolet	Cavalier	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1992	Chevrolet	Corsica	2.2L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1989	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1989	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1989	Chevrolet	Corsica	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1988	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1988	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1988	Chevrolet	Corsica	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1988	Oldsmobile	Firenza	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1987	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1987	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1987	Chevrolet	Corsica	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1987	Oldsmobile	Firenza	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Buick	Skyhawk	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Cadillac	Cimarron	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Oldsmobile	Firenza	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Oldsmobile	Firenza	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Pontiac	Sunbird	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1986	Pontiac	Sunbird	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Buick	Skyhawk	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Cadillac	Cimarron	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Oldsmobile	Firenza	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Oldsmobile	Firenza	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Pontiac	J2000 Sunbird	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1985	Pontiac	J2000 Sunbird	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Buick	Skyhawk	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Cadillac	Cimarron	—	—	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Chevrolet	S10	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Chevrolet	S10 Blazer	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	GMC	S15	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	GMC	S15 Jimmy	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Oldsmobile	Firenza	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Oldsmobile	Firenza	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Pontiac	J2000 Sunbird	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984	Pontiac	J2000 Sunbird	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Buick	Skyhawk	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Buick	Skyhawk	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Cadillac	Cimarron	—	—	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Chevrolet	Cavalier	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Chevrolet	S10	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Chevrolet	S10 Blazer	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	GMC	S15	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	GMC	S15 Jimmy	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Oldsmobile	Firenza	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Oldsmobile	Firenza	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Pontiac	J2000	2.0L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983	Pontiac	J2000	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982	Buick	Skyhawk	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982	Cadillac	Cimarron	—	—	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982	Chevrolet	Cavalier	1.8L	L4	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982	Oldsmobile	Firenza	—	—	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982	Pontiac	J2000	—	—	N/A	4 Required; 42.3 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
No rows match your filter.

Directly replaces or cross-references 2 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

12337839EPC-272