Since the introduction of the Mitsubishi 4G63 engine that install on VR4 or EVO, their cylinder head gasket had since evolve from graphite type to metal type. And at the stage of metal type gasket, it had change from the thickness from 0.4mm to 1.5mm due to the turbo charge modification.
As their original piston bore design at 85mm, their cylinder head gasket is design at a normal diameter of 86mm, but still there are more modification come up. With the piston bore modified to 86mm, the original size of cylinder head gasket is no more suitable for this usage purpose, hence, the requirement for the 86.5mm and 87mm diamenter on the cylinder head gasket had come out.
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