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Re: Should I use gasket sealant?
Sealant on the head bolts is not necessary, and in fact would not really serve a purpose. If anything, applying a threadlock compound may be useful, but as long as you torque the bolts correctly, nothing extra is required.
As for the intake manifold, only the gasket is necessary, and again, so long as torquing is done correctly you shouldn't need anything else. However, there are some things you may find useful here, and one of my favorites to use is the Indian Head Shellac Compound made by Permatex. It is a thin layer of sealant, apply to the head and the intake with your gasket between and put together.That should help with coolant leakage around the gasket, but the gasket itself can still become damaged over time by the exposure to water.
I use the Indian Head Shellac on just about every gasket these days. I've never had anything leak since I started using it. It doesn't require a long curing time like silicone does either.
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