Sierra 18-2960 Head Gasket, Replaces OMC 313413, for Johnson/Evinrude 50 HP Outboards (1971-1975)

The Sierra 18-2960 is a head gasket engineered for Johnson and Evinrude 50 HP outboard motors (1971-1975). It seals the mating surface between the cylinder head and powerhead block, maintaining proper compression and preventing coolant or combustion leakage during operation. The gasket features a machined exterior finish for a precise, consistent fit against the block and head surfaces.

This gasket is a direct replacement for the original equipment part, and Sierra manufactures it to meet or exceed the specifications of the OEM component it replaces. Each package contains one head gasket, ready to install as part of a powerhead rebuild or top-end service. The 18-2960 measures 5.75 x 1 x 15.5 inches and weighs 0.21 pounds.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2960
• UPC: 030999314598
• Product Dimensions: 5.75 x 1 x 15.5 inches
• Weight: 0.21 pounds
• Exterior Finish: Machined
• Package Quantity: 1 gasket per package
• Fitment: Johnson/Evinrude 50 HP outboards (1971-1975)
• OEM Cross Reference: 313413

Fitment

• Johnson 50 HP outboards (1971-1975)
• Evinrude 50 HP outboards (1971-1975)

Replaces (OEM)

• 313413

Frequently Asked Questions

What does the Sierra 18-2960 head gasket fit? The Sierra 18-2960 is built for Johnson and Evinrude 50 HP outboard motors from 1971 to 1975.

Is 18-2960 the same as OMC 313413? Yes, Sierra 18-2960 is a direct replacement for the original equipment OMC part number 313413.

How much does this gasket weigh? The Sierra 18-2960 head gasket weighs 0.21 pounds.

What are the dimensions of the 18-2960 head gasket? It measures 5.75 x 1 x 15.5 inches, sized to seal the head-to-block mating surface on Johnson/Evinrude 50 HP powerheads.

How many gaskets come in a package? Each package of the Sierra 18-2960 contains one head gasket.

Does the 18-2960 meet OEM quality standards? Sierra manufactures the 18-2960 head gasket to meet or exceed the specifications of the original equipment part it replaces.

What finish does the 18-2960 gasket have? The 18-2960 head gasket has a machined exterior finish for a precise seal against the head and block.

Is the Sierra 18-2960 a genuine OEM part or aftermarket? The 18-2960 is a Sierra aftermarket replacement gasket, engineered to meet or exceed the OEM part it replaces rather than being sourced from Johnson/Evinrude directly.

Will the 18-2960 gasket work on other horsepower outboards besides 50 HP? The 18-2960 head gasket is designated for Johnson and Evinrude 50 HP outboards (1971-1975); no other horsepower applications are listed for this part.

What UPC is associated with the Sierra 18-2960 gasket? The Sierra 18-2960 head gasket carries UPC 030999314598.

Is the Sierra 18-2960 head gasket still available from the manufacturer? Yes, the Sierra 18-2960 head gasket has not been discontinued by the manufacturer.

What part does the Sierra 18-2960 replace during a powerhead rebuild? During a Johnson/Evinrude 50 HP powerhead rebuild, the 18-2960 replaces the original head gasket, OEM number 313413.