I blew a head gasket today so i am in the market for a new one. Who makes the toughest, best sealing head gasket?

 

I think cometic is about the best head gasket. The problem may be in your studs,though. The one thing that kept me away from the 89mm big bore was head gasket issues. My engine builder had lost a few head gaskets until he heard about the beefier studs. Mine was already underway at that point, but since then the problem hasn't came back. I don't know who does the bigger studs but I,m sure someone on here does. Maybe curtis sparks.

 

the FDO studs are supposed to rock. i have a feeling the studs are your problem also. i run a cosmetic with good luck in my 406