US Patent 7815197 Gasket

A gasket which can secure a sufficient sealing capability even for compact, light and less rigid high-performance engines is to be provided. The gasket comprises a metallic base plate and a shim plate stacked around each of combustion chamber holes in the base plate. A base plate bead consisting of a full bead is formed along the circumference of each of the combustion chamber holes. The shim plate is large enough to be arranged opposite a first flat part, a base plate bead formation position A and a second flat part in the base plate. A plurality of strips of auxiliary beads are formed in the part of the shim plate opposite the base plate.