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 & corrosion. All gaskets are coated with a special fluorine rubber coating to provide the ultimate sealing. MK4 Supras use the stopper type head gasket, the top one in the picture. The stopper type is the most effective & consists of the maximum layers of plates for the best possible seal. The Performance requirements from Head Gaskets:
As the cylinder block and head are not one piece, as the hold bolts are tightened, the gap between the surfaces and the surface pressure applied is not even across the whole surface. Moreover, when driving, due to combustion pressure and vibration, the conditions are continually changing and the contact surface is being continually beaten. As a result a good gasket must ensure that contact surface pressure is spread as evenly as possible and also adapt quickly to the ever changing gaps that can appear in the contact surface to maintain a good seal with good pressure.
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