What do some head gaskets incorporate to help contain heat and pressure?

Some head gaskets incorporate fire rings to help contain heat and pressure. Fire rings are typically constructed of solid metal and are placed around the combustion chamber within the gasket. Their primary function is to provide a robust barrier that can withstand the extreme temperatures and pressures present in the combustion process.

By surrounding the combustion chambers, fire rings prevent the blow-by of gases and help maintain the integrity of the seal between the engine block and the cylinder head. This is essential for engine performance, as it minimizes the risk of engine leaks and maintains optimal compression. The use of fire rings is particularly important in high-performance or heavily loaded diesel engines, where the pressure and heat generated can exceed the capabilities of standard gasket materials.