I like a product from permatx called Aviation Form-A-Gasket. It comes in a white bottle with blue print and says Aviation on it. The cap has a brush attached to it so you can brush it on the bolt threads. It will not affect your torque readings. I also like to use it around the intake ports applying some on the head and manifold sides, then use Permatex Ultra Black around the water ports, once again on the head side and the manifold side. Aviation never dries completely, so it keeps a very good seal and will not bond your bolt to the block, thus making for very hard head bolt removal in the future. A product that does dry hard that comes to mind is called indian......somthing, not sure what the full name is but it has a picture of an indian on the bottle and it's usally a brown bottle
You must clean the head bolts treads before installing them, using a bench grinder with a wire wheel works good for this, just be sure to wear your safety glasses and be aware of the bolt getting caught and kicking back.
Take your time and check for threads that have been eaten up by water from before and are damaged. replace as nessary. It's also a good idea to run a tap down the head bolt hole threads, but be carefull and take your time doing this also, a little lube will help (wd40).
If you use any of the above methods to seal your intake use just a thin amount on the head and intake side of the permatex and aviation. The goal is to use the products to assist sealing the head and intake to the gasket. Using anymore than what will sqeeze out when you tighten down the bolts is too much and never use silicone around your intake ports.
Good Luck [img]graemlins/thumbsup.gif[/img]
Sorry for th long post [img]graemlins/boring.gif[/img]