Head Cover Gasket – Fits Mercury/Johnson/Evinrude 20 HP (Replaces 27-78410, 508810) 435HP Produced in an ISO 9002

Produced in an ISO 9002 certified factory for quality assurance

Clean the mounting surface on the engine block to ensure the new tensioner sits flush

including galley systems

It explicitly excludes 4

a basic screwdriver or wrench may be required

Head Cover Gasket – Fits Mercury/Johnson/Evinrude 20 HP (Replaces 27-78410, 508810) 435HP Produced in an ISO 9002Product Details This high quality Head Cover Gasket is designed to provide a reliable seal for a range of outboard motors, including specific Mercury, Johnson Evinrude, and Chrysler 2 stroke models from 19781980. It ensures a precise fit to prevent leaks and maintain engine performance. This gasket serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 27 78410, 52579, 72916, 78410; OMC Johnson Evinrude 508810;