Cometic Phuzion headgaskets
The company that makes the seals has a wide variety of interesting sealing technology:
http://www.techneticsgroup.com/products/sealing-solutions/metal-seals/o-flex/
Cool stuff!
BTW, this is by no means a recommendation to buy one. I am in general distrustful of Cometic's headgaskets as they seem to have more issues that I would like and have excellent options from Honda (as I mostly work on or with the Honda D-series engine). But, I think that the tech is really awesome compared to some more classic and typical headgasket sealing "tricks" like o-ringing.
