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DO NOT USE COPPER GASKETS IN A WATER COOLED ENGINE!!!!!!!!!! They seal compression VERY well but they leak oil and water like a sieve! All I do monday-friday is help people build drag bike engines. If they tell me it will be a track only oil/air cooled bike, copper and o-ringed cylinders. If its water cooled, or ridden on the street at all, it better be a multi-layed steel. Call Cometic, they can stamp you out a thicker base gasket, and a good head gasket. Spacing up they cylinder is the better option over a thicker head gasket. As long as you have proper torque and a perfectly clean and flat surface your head gasket should hold.
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