Sierra 18-4303-1 Powerhead Gasket Set for Johnson Evinrude V4 Crossflow

The Sierra 18-4303-1 Powerhead Gasket Set is a comprehensive gasket kit designed for Johnson and Evinrude V4 Crossflow outboard engines manufactured between 1977 and 1992. This complete gasket set provides all the essential seals needed for powerhead service and rebuilds, ensuring proper sealing and optimal engine performance.

Complete Kit Includes:

• Fuel pump mounting gasket (18-0850)
• By-pass cover gaskets (18-2876) - 4 pieces
• Exhaust cover gaskets (18-2866) - 2 pieces
• Water passage gasket (18-0953)
• Exhaust plate gasket (18-0117)
• Water jacket head gaskets (18-2956) - 2 pieces
• Manifold to crankcase gasket (18-2867)
• Air silencer to carburetor gaskets (18-2857) - 2 pieces
• Air silencer gasket (18-0985)
• Adapter to powerhead gasket (18-2864)
• Leaf plate gaskets (18-0991) - 4 pieces
• Water passage cover gasket (18-2547)
• Exhaust manifold gasket (18-0102)
• Intake plate gasket (18-0134)
• Thermostat gaskets (18-0977) - 2 pieces

This gasket set replaces OEM part numbers 439085, 391300, 389556, 39080, and Mallory 9-64112. Sierra marine products are engineered to meet or exceed original equipment specifications and are built to withstand the demanding marine environment.