HKS metal head gaskets are constructed from multiple layers of steel to ensure proper head to block sealing, even under the most severe conditions. The special metal used in the construction of the head gaskets is resistant to both heat and corrosion. All gaskets are coated with a special fluorine rubber coating to prove the ultimate sealing. HKS MHGs are available in three different construction types: stopper, grommet, and beaded.
The 'stopper' type is most effective in sealing because it incorporates a stopper instead of a grommet or bead which can be weak over a period of time. Stopper gaskets consist of the most metal layers for the best possible seal. The 'stopper' type gasket is the most expensive of the three. The 'bead' type is the most popular gasket, due to its simplicity of construction. A raised bead around each combustion chamber ensures a tight seal for high-compression as well as high-boost applications. This gasket is very effective for sealing because of its flexibility. The beaded type gasket is the least expensive of the three. The 'grommet' type gasket is a very effective type of gasket due to the metal grommet that surrounds each combustion chamber. This metal grommet insures a tight seal between the cylinder head and the engine block. The application of grommet gaskets is limited due to the high cost of production.
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