Cometic Nissan Silvia 240SX 91mm .045 inch MLS Head Gasket KA24DE 1990 UP Woman Wins UK Cheese Rolling Race In Most Terrifying Way HuffPost UK News. Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0. 045". Cometic MLS (Multi Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flour elastomer rubber based material that is heat resistant to 250 C 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements. The embossed outer layers of the gaskets meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes The center or shim layer is an uncoated stainless steel layer which can be varied to accommodate multiple thickness requirements Requires less clamp load creating less bore distortion Conforms load distribution across the sealing area Embossed Outer Layers Coated w Viton This Part Fits: Year Make Model Submodel 1991 1993,1995 1998 Nissan 240SX Base 1991 1992,1997 1998 Nissan 240SX LE 1991 1998 Nissan 240SX SE 1998,2002 2003 Nissan Frontier Base 1998 1999 Nissan Frontier SE 1998 2004 Nissan Frontier XE 2000 2004 Nissan Xterra XE