I will say some of us get lucky using the cork seals,I sure have in all my builds.I always lay a small amount of sealant than the gasket than some more sealant and lots in the corners let set up for 15 minutes slowly tighten down here and there for the next 2 hours so nothing slips,now from what I think one should do is to not start up for 24 hours,let all dry real good.