Originally Posted by MouseFink
Don’t use silicone sealer on anything. That is terrible sealer, and it will get into your cooling system. The excess silicone sealer does not dissolve.
Use a small amount of Permatex “The Right Stuff”. It seals between the gasket and accessory.
The Right Stuff is my favorite, it's all I use.
I have a pretty strong feeling I forgot thread sealer on a bolt or 2. It's been about a year since I put the engine together, so I'm not sure, but that's what I'll check first.