Ryoken, I agree that it is kinda scary, but I have heard (but not tried it myself) that if you have stubborn intake manifold end leak, that stacking two cork gaskets can work. The idea is that stacking provides additional height to fill a larger gap, and the cork can compress a bit if it is too tall. Obviously you wouldn't use two if one would work. And yes, don't use RTV or silicone with the cork, use the sealer stuff to glue it all together. I have some green stuff I really like - can't remember the name of it but it works very well.
