Cometic C9933 Multi-Layer Steel Head Gasket .040" Twin Cam

The Cometic C9933 is a premium Multi-Layer Steel (MLS) head gasket engineered specifically for Twin Cam applications. This gasket features a .040" compressed thickness and is designed for S&S Super Stock heads and similar performance 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" thick Viton rubber bonded to stainless steel
• Non-intrusive rivets hold the layers together
• Load Control Embossments (LCE) promote even torque distribution across the sealing surface

Performance Benefits:

• Reduces bore distortion for improved piston ring seal and increased power output
• Maintains .040" thickness when torqued—does not compress
• Ideal for both aluminum-to-aluminum and aluminum-to-cast iron applications, withstanding shearing forces between dissimilar materials
• Multiple stainless steel layers provide increased strength, rebound capability, and corrosion resistance

Installation Notes:

• Install dry—no additional sealant required as gasket is pre-coated
• Requires surface finish of 50 RA (roughness average) or finer for proper seal
• Smooth, flat, and true head and deck surfaces are essential for MLS gaskets to seal properly
• Sold as a pair for twin-cylinder applications

Made in the U.S.A. and backed by Cometic's reputation for high-performance sealing solutions.