Sierra Head Gasket 18-3803, Replaces OMC 329419, for 2-Cylinder Outboard Engines

The Sierra 18-3803 Head Gasket is a replacement gasket designed to seal the cylinder head on 2-cylinder outboard engines. It is built to the OEM cross-reference OMC 329419, making it a direct fit for the power head applications that number covers. The gasket has a round shape and a white finish, and is sized to seat correctly between the cylinder head and the power head to maintain proper compression and prevent coolant or combustion leaks at the head joint.

This part is intended for service and rebuild work on 2-cylinder outboard power heads, where the head gasket is a wear item that should be replaced any time the cylinder head is removed for inspection, decarbonizing, or repair. Using the correct gasket for the specific engine helps ensure a proper seal and avoids the compression loss, coolant leaks, or blown-gasket failures that come from reusing an old gasket or fitting an incorrect one.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3803
• Product: Head Gasket
• Color: White
• Shape: Round
• Weight: 0.1 pounds
• UPC: 030999316547
• Fitment: 2-cylinder outboard models
• OEM Cross Reference: OMC 329419

Fitment

• 2-cylinder outboard power head models only

Replaces (OEM)

• OMC 329419

Frequently Asked Questions

What engines does the Sierra 18-3803 head gasket fit? The Sierra 18-3803 head gasket is for 2-cylinder outboard models only, sealing the cylinder head to the power head on those engines.

What OEM part number does 18-3803 replace? It replaces OMC 329419, so any engine calling for that OEM number can use the Sierra 18-3803 instead.

What color is the 18-3803 head gasket? It is white and round in shape, matching the factory head gasket profile it replaces.

How much does the 18-3803 head gasket weigh? The Sierra 18-3803 head gasket weighs 0.1 pounds.

Is the Sierra 18-3803 an OEM-equivalent part? Yes, it is manufactured to match OMC 329419 as a direct cross-reference replacement for that OEM head gasket.

Will this gasket work on a 4-cylinder or V-engine outboard? No, the 18-3803 head gasket is designated for 2-cylinder models only and should not be used on 4-cylinder or V-configuration outboard power heads.

When should I replace this head gasket? The 18-3803 head gasket should be replaced any time the cylinder head is removed from a 2-cylinder outboard power head for service, since the old gasket should not be reused.

What is included when I order the Sierra 18-3803? You receive one Sierra 18-3803 head gasket, sized for a 2-cylinder outboard power head.

Does the Sierra 18-3803 come with a warranty? Yes, the Sierra 18-3803 head gasket carries a limited warranty.

Is the 18-3803 gasket round or another shape? It is a round gasket, matching the cylinder head bolt pattern and bore layout of the 2-cylinder power heads it fits.