This cylinder head gasket seals the combustion chamber between the cylinder head and the engine block. It prevents the escape of compression gases and engine oil while keeping coolant contained within its dedicated passages. A failed gasket allows cross-contamination between these fluids, causing overheating, misfiring, or oil dilution. The gasket is manufactured to match the original sealing surface geometry, ensuring proper clamp load distribution when the head bolts are torqued to specification. On reinstallation, clean both mating surfaces thoroughly and replace the head bolts if they are torque-to-yield type.