Extreme Sealing Technology (EST)


Cometic MLS (multi-layer-steel) Head Gaskets are ideal for any combination of head and cylinder materials. MLS Head Gaskets are comprised of two embossed viton coated stainless steel outer layers and a variable stainless center layer. The variable center layer allows us to create multiple gasket thickness options. No re-torque is required after initial torque set. Rubber coated single layer steel base gaskets are viton rubber coated with a steel core and in some instances embossed. Cometic AFM material engine cover gaskets are made from a chemically blown compounded nitrile synthetic rubber that is bonded to an aluminum core. AFM material has a temperature resistance of over 250° F (121° C) and an 85% recovery while maintaining a strong torque retention. Gaskets made from AFM install dry and do not require a re-torque. Typical gaskets made from AFM include: cam chain gaskets, timing cover gaskets and water pump gaskets. Viton valve stem seals are made from hi-temperature Flouroviton with Teflon to prolong valve stem life and have a spring on the wiper to maintain a positive seal. Exhaust gaskets are made out of various materials, as required by model, such as armor clad, copper, graphite or spiral wound steel. Copper washers and Viton o-rings are used to seal drain plugs and engine covers with stock o-ring seals.
	ATV and Off-Road/Dirt EST Gasket Kits contain components required for a typical 4-stroke top end rebuild or repair. Available now! Check out the 2006 Cometic Powersports catalog.
	Harley-Davidson® EST Gasket Kits contain MLS Head Gaskets, Steel Viton coated Base Gaskets, blue Viton Valve Stem Seals and AFM material. Other features include the Race Style Exhaust Gasket, that won’t fray into the port, and the one piece Evolution Rocker Box Base Gasket which is made from a single layer of .020” thick embossed Viton coated steel. EST kits are available in Complete Motor Kits and Top End Kits. EST kits are made for any builder who demands the best and appreciates the long-term value for his/her dollar!
	Sport Bike (Metric) EST Head Gaskets create Bolt-on cost-effective performance! All EST Head Gaskets are 2-layers with a .018” thickness. This is a quick cost effective way to tighten your squish area and gain horsepower. Pricing on our EST 2-Layer Head Gaskets is very competitive with OEM 2-layer head gaskets. Available now! Check out the 2006 Cometic Powersports catalog.