I use the 'Right Stuff' brand name sealant (gasket maker, puckey, goop, whatever ya wanna call it) and have good luck with it, even with synthetics (oil, ATF, antifreeze even water, no fuel yet, don't recall if that's reccomended for it or not ).
X2 just about ever engine build that I know of has switched to the Right Stuff.
I used to use permatex copper silicone - no more this right stuff has never leaked on my - just wipe the surfaces/spray the down with lacquer thinner - allow to dry and apply - never had a leak.
GM is using this on all there new engines - no more cut gaskets - just sealer.
Matter in fact i think the only place they use a cut gasket these days in on Auto trans pan gaskets.
