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21. The intake was ready to be bolted on, but before that I took some extra time to properly seal the intake gaskets. I really like using gray silicone on anything with oil, water, or fuel to help seal gaskets. I ran a small layer of gray silicone on the underside and top side of the intake gasket water passage. A 3⁄8 bead of gray silicone was also used to seal the lifter valley to the intake manifold.