Andy is right, I forgot the name, but that's the stuff..Permatex

You don't use the stuff on a head gasket. The head is placed without any silicone gasket maker. Just a gasket only for the head.
What I mentioned was the corners like the timing cover valve cover makes a 90 degree turn in front of engine. Right in that 90 where head, valve cover, timing cover meet and the half moon rubber gasket at the back side. Use the silicone where the half moon gasket meets the heads on the flat where the valve cover is placed onto. Your trying to keep engine oil from seeping out of the cracks. I also took some silicone on my finger a ran it on the valve cover before the valve cover gasket was pushed into the groove of the cover. This keeps that cover gasket in and sealed. Then ran a thin amount on that cover gasket just before I placed the valve cover onto the head. Don't want it oozing out all over, just enough to seal it from seeping oil down the block. Don't want to use so much also that it oozes into the motor either. Use your judgment and use enough to seal those pesky places that tend to leak oil after a short time.

Sorry if I confused you. The manual should also show these areas to seal up or place a small amount of sealer.