Description
The Cometic Top End Gasket Kit C3604-EST is engineered for select KTM, Husqvarna, and GasGas 450/500 models. This kit includes the correct base, head gasket, and cylinder O-rings, plus other top end specific O-rings or seals required for top end service. Multi-layer steel (MLS) head gaskets provide even torque load, reducing bore distortion and enhancing piston ring seal for maximum power. EST (Extreme Sealing Technology) gaskets feature embossed stainless steel components coated in a proprietary rubber material for superior sealing. Designed for high-output, high-cylinder-pressure, 4-stroke engines, these gaskets dissipate heat away from the combustion ring to eliminate hot spots and prevent gasket failure. Made in the USA.
Fitment includes many late-model KTM, Husqvarna, and GasGas 450/500 bikes. Please verify compatibility for your application.









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