Sierra 18-2961 Head Gasket for Johnson/Evinrude 6 HP Outboard, 1965-79

The Sierra 18-2961 Head Gasket is a replacement head gasket engineered for Johnson and Evinrude 6 HP outboard motors from 1965-79. It seats between the cylinder head and the power head to seal the combustion chamber and coolant passages, maintaining proper compression and preventing coolant or exhaust leaks at the head joint. This gasket is a direct fit for the specified 6 HP Johnson/Evinrude application and is built to meet or exceed the performance of the original equipment part it replaces.

Installation is a standard head-gasket swap performed whenever the power head is removed for service, such as during a top-end rebuild or when addressing a compression or coolant leak. Using a properly fitted, correctly specified gasket like the 18-2961 helps ensure a reliable seal and consistent engine performance after reassembly.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2961
• Product Type: Head Gasket
• Color: White
• Weight: 0.08 pounds
• UPC: 030999314604
• Fitment: Johnson/Evinrude 6 HP outboard, 1965-79
• OEM Cross Reference: GLM 33830, Johnson/Evinrude 306204, 329103

Fitment

• Johnson/Evinrude 6 HP outboard motors, 1965-79

Replaces (OEM)

• GLM 33830
• Johnson/Evinrude 306204
• Johnson/Evinrude 329103

Frequently Asked Questions

What engine does the Sierra 18-2961 head gasket fit? The Sierra 18-2961 is designed for Johnson and Evinrude 6 HP outboard motors from 1965-79.

Is the 18-2961 gasket interchangeable with any OEM numbers? Yes, the Sierra 18-2961 is interchangeable with GLM 33830 and Johnson/Evinrude Outboard numbers 306204 and 329103.

How much does the 18-2961 head gasket weigh? The Sierra 18-2961 Head Gasket weighs 0.08 pounds.

What color is the Sierra 18-2961 head gasket? It is white, consistent with the finish Sierra uses for this head gasket.

Is this a genuine Sierra part or an aftermarket copy? The 18-2961 is a genuine Sierra replacement part, manufactured to meet or exceed the original equipment part it replaces.

Will the 18-2961 work on a 6 HP Johnson or Evinrude built after 1979? No, the Sierra 18-2961 is specified for 6 HP Johnson/Evinrude outboards from 1965-79; later 6 HP models use a different Sierra part number.

When should this head gasket be replaced? The 18-2961 should be replaced any time the power head is removed for service on a 6 HP Johnson/Evinrude, 1965-79, such as during a top-end rebuild or when a compression or coolant leak is present at the head joint.

What is included with the Sierra 18-2961? The product includes one Sierra 18-2961 Head Gasket.

Does the 18-2961 come with a warranty? Yes, the Sierra 18-2961 Head Gasket is covered by a limited warranty.

What UPC is associated with the Sierra 18-2961? The Sierra 18-2961 Head Gasket carries UPC 030999314604.