Cometic C10041-JS-030 Top End Gasket Kit 4.125" Bore S&S Super Sidewinder .030" MLS

The Cometic C10041-JS-030 is a complete top end gasket kit engineered specifically for S&S Super Sidewinder Plus engines with 4.125-inch bore, built to John Sachs specifications. This comprehensive kit includes everything needed for a complete top end rebuild from the base gasket up to the rocker boxes.

Key Features:

• Multi-Layer Steel (MLS) head gaskets with .030-inch compressed thickness
• Comprised of multiple embossed layers of stainless steel with outer layers utilizing Viton rubber coating
• Designed for S&S Super Sidewinder Plus engines with wider stud spacing pattern
• 4.125-inch bore specification for high-displacement V-twin applications
• Thinner than OEM gaskets for optimized compression ratio and performance tuning
• Complete kit includes head gaskets, base gaskets, rocker cover gaskets, seals, washers, and O-rings
• Superior sealing capability compared to composite gaskets
• Does not compress after installation—maintains .030-inch thickness when torqued

Important Installation Notes:

• Proper deck height and piston-to-valve clearance checks are critical before installation
• Recommended torque sequence: 25, 35, 45 ft-lbs for MLS gaskets (differs from OEM composite gasket specs)
• Use of these head gaskets without proper clearance verification can lead to catastrophic engine failure
• Designed specifically for Super Sidewinder stud spacing—verify compatibility with your engine configuration

Cometic's MLS technology provides exceptional sealing performance for high-performance V-twin builds, making this kit ideal for engine builders and performance enthusiasts working with S&S Super Sidewinder engines built to John Sachs specifications.