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Engine Valve Cover Gasket Overview

The valve cover gasket forms a critical seal between the valve cover and the top of the engine’s cylinder head. Its primary function is to prevent engine oil and oil vapors from leaking at this junction. To do so effectively, the gasket must offer enough compressibility to accommodate minor surface imperfections and maintain a tight seal.

Modern valve cover gaskets are typically made from rubber or other elastomeric materials. Some are simple rubber gaskets, while others may include metal or composite reinforcements to provide added strength and durability.

In contrast, older European or classic vehicles may use cork or similar natural materials for the gasket. These materials are particularly sensitive to installation technique and torque specifications. Extra care must be taken during installation to avoid over-tightening and damaging the gasket, especially with cork, which can be easily crushed and rendered ineffective.