Hey guys. Cometic are now offering a multilayer headgasket that is .018" inches thick. They make custom gaskets with no minimum production run. I don't know if the construction of this gasket would preclude it from the air-cooled twins or not. If we knew the volume, or at least the thickness, of the OEM gasket, we could derive the change in the (nominal) compression ratio with an ultra-thin gasket such as this with some straightforward math. Obviously, the piston deck height and piston to valve clearances would deserve a look. The clearances are likely to be cavernous, anyway. It seems that I've mentioned this around here before, but I'm far from my bike for now and ideas like this get stuck in my mind like a booger...just gotta get it out there :-D