Sierra 18-2959 Head Gasket for Johnson/Evinrude Outboard Motors Gaskets & Seals

The Sierra 18-2959 is a marine cylinder head gasket engineered as a direct replacement for Johnson and Evinrude outboard motors. Designed to restore a proper combustion seal, this head gasket delivers reliable performance in demanding marine environments.

Key Features:

• Direct OEM replacement — replaces OMC part number 306048 (also cross-referenced as 5043)
• Manufactured by Sierra International (a Seastar Solutions brand) to meet or exceed original equipment standards
• Built to withstand the rigors of marine use, including exposure to water, heat, and pressure cycling
• Ensures a reliable combustion chamber seal to maintain engine compression and prevent coolant intrusion

Sierra International is a trusted name in marine aftermarket parts, offering replacements for thousands of outboard and sterndrive components. The 18-2959 head gasket is a straightforward, quality replacement that helps restore lost engine performance on compatible Johnson and Evinrude outboard applications.