Sierra Head Gasket 18-3878, Replaces 27-52364, for GM 181 (3.0L) CID Marine Engines

The Sierra 18-3878 is a head gasket engineered for GM 181 cubic inch (3.0L) CID marine engines. It seals the joint between the cylinder head and engine block, maintaining compression and preventing coolant or oil from leaking into the combustion chamber or crossing between cylinders. This is a common wear item during a top-end rebuild, cylinder head removal, or when addressing a blown gasket that is causing coolant loss, overheating, or compression loss.

Sierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, and it is built to install as a direct fit for GM 181 (3.0L) CID engines. The gasket has a white finish and is sold as a single-piece replacement part.

Every Sierra part is backed by Sierra's customer satisfaction warranty, giving boat owners and marine technicians a dependable option when servicing GM 181 (3.0L) powered engines.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3878
• Product Type: Head Gasket
• Color: White
• Weight: 0.51 pounds
• UPC: 808282258931
• Fits: GM 181 (3.0L) CID Engines

Fitment

• GM 181 (3.0L) CID Engines

Replaces (OEM)

• 27-52364
• 27-81084
• FI5000204

Frequently Asked Questions

What engine does the Sierra 18-3878 head gasket fit? The Sierra 18-3878 head gasket is designed for GM 181 cubic inch (3.0L) CID marine engines.

Which OEM part numbers does 18-3878 replace? Sierra 18-3878 replaces OEM numbers 27-52364, 27-81084, and FI5000204.

How much does the 18-3878 head gasket weigh? It weighs 0.51 pounds, as listed for the Sierra 18-3878 head gasket.

What color is the Sierra 18-3878 head gasket? The gasket has a white finish.

Is the Sierra 18-3878 a genuine OEM part or an aftermarket replacement? It is an aftermarket part manufactured by Sierra to meet or exceed the specifications of the original equipment head gasket it replaces.

Does Sierra back the 18-3878 head gasket with a warranty? Yes, the Sierra 18-3878 head gasket is covered under Sierra's customer satisfaction warranty.

What is included when I order part number 18-3878? The order includes one Sierra 18-3878 head gasket.

How can I confirm the 18-3878 is the correct head gasket for my engine? Match your engine to a GM 181 (3.0L) CID engine, or cross-check against OEM numbers 27-52364, 27-81084, or FI5000204, which the Sierra 18-3878 replaces.

When would I need to replace a head gasket like the 18-3878? A head gasket such as the 18-3878 is typically replaced during a cylinder head removal, top-end rebuild, or when a failed gasket is causing coolant loss, overheating, or a loss of compression.