Cometic C8917 MLS Head Gasket .030 Inch Compressed Thickness Multi-Layer Steel

The Cometic C8917 is a Multi-Layer Steel (MLS) head gasket constructed from multiple layers of stainless steel designed to provide superior sealing performance for high-performance engines. This gasket features a .030 inch compressed thickness, making it ideal for high compression applications.

Advanced MLS Construction:

• Three-piece design with a stainless steel center layer sandwiched between two viton-coated spring steel embossed outer layers
• Each outer layer is coated with .001 inch thick Viton rubber bonded to the stainless steel for superior sealing
• Load-controlled embossments help distribute clamping force evenly across the sealing area, requiring less clamp load and reducing bore distortion
• Non-intrusive rivets hold the layers together

Performance Features:

• Provides maximum sealing performance for high output engines and requires no sealants
• Reduces bore distortion and withstands extreme cylinder pressures
• Ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks
• Stainless steel outer layers utilize rubber-binder coating featuring high-temperature and chemical-resistant polymers

Installation Requirements:

• Requires smooth, flat, and true head and deck surfaces to seal properly
• Surface finish of 50 RA (roughness average) or finer is recommended for proper sealing
• Piston-to-head clearance should be verified (.030-.032 inch optimum) before installation
• Install dry - no additional sealant required as gaskets are pre-coated

Cometic MLS gaskets deliver the reliability and performance demanded by racing applications, forced induction setups, and high-compression builds where standard gaskets cannot withstand the extreme conditions.