Cometic C9721-084 Harley-Davidson Twin Cam .084" MLS Cylinder Head Gasket

The Cometic C9721-084 is a Multi-Layer Steel (MLS) cylinder head gasket engineered for Harley-Davidson Twin Cam engines. This variant features a .084" compressed thickness and a 3.875" bore, making it an ideal choice for builds requiring additional head gasket thickness, such as stroker applications or engine rebuilds using overbore pistons.

Cometic's MLS construction uses three layers of stainless steel, with the outer layers embossed and coated with a fluoroelastomer rubber compound that is heat-resistant to 482°F (250°C). This design delivers consistent sealing pressure across the entire gasket surface, resists corrosion, and rebounds under repeated heat cycling — eliminating the risk of blown or compromised head gaskets under demanding conditions.

Key Features:

• Multi-Layer Steel (MLS) construction — three stainless steel layers for superior strength and rebound
• .084" compressed thickness — suits stroker builds and specific compression ratio requirements
• 3.875" bore diameter
• Fluoroelastomer rubber coating on outer layers — heat resistant to 482°F (250°C)
• Precision-cut for accurate, leak-free fitment
• Made in the USA with American-sourced materials
• Sold as a pair (both cylinders included)

Cometic is a leading worldwide supplier of performance gaskets and engine sealing solutions, trusted by professional builders and performance enthusiasts across powersports, V-twin, and motorsports applications.