This gasket is the first of its kind to offer this unique 4-layer head gasket Each of the four layers is designed to interact with the mating layer in the stack The functional layers are designed with a reverse embossment that interacts with the two layers between Each gasket is coated on two sides and embossed around each oil passage, no o-rings or additional sealers are required Each kit contains 2 MLS cylinder head gaskets and 2 beaded metal cylinder base gaskets