What is a rocker cover gasket?

A rocker cover gasket is a seal located between the rocker cover (or valve cover) and the engine cylinder head in an internal combustion engine. Its primary function is to prevent oil leaks from the engine, ensuring that the oil remains contained within the engine and does not escape onto other components. Made from materials like rubber or silicone, the gasket also helps maintain proper pressure within the engine. Proper sealing is essential for optimal engine performance and to prevent contamination of engine oil.