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Athena Racing 338 series multilayer steel (MLS) cylinder head gasket.Athena MLS gaskets are designed to suit the requirements of today’s competition engines offering enhanced sealing compared to the OEM product. The gaskets are assembled from 2-5 layers of high quality stainless and spring steels.Part number 338476RGasket thickness: 0.90mmBore size: 78.50mm Part number starting with 338 Athena advantages Optimized radius embossing shape The round shape of the embossing increases sealing on cylinder bore, oil and cooling water passages and improves spring back strength Advanced stopper technology State of the technology enhances sealing pressure around the cylinder. Highest sealing properties in high power engines Coating technology Designed & engineered by Athena the special coating applied on steel surfaces, improves temperature resistance & reliability of the head gasket

COMETIC MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for today's 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 flouroelastomer 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.

COMETIC MLX (Multi-Layer Stopper) gaskets utilize an integrated stopper layer for combustion chamber sealing and improved clamp load around the cylinder without increasing bore distortion. MLX technology can be found in some head gaskets and are made from the same materials as our MLS Head Gaskets. No sealants or re-torque required.