Rocker cover gaskets create a static seal between the cylinder head and the rocker cover, preventing oil leakage and maintaining engine oil pressure. These gaskets are located on top of the engine, sealing valve train components housed beneath the cover. Materials commonly include compressed fiber, rubber, or multi-layer composite constructions for resistance to heat and oil degradation. Precise fit and torque are critical during installation to ensure a reliable seal and prevent valve train contamination. Variations exist to accommodate different valve cover designs and engine configurations, including those with integrated spark plug tube seals.