Intake end gaskets

I've always used the cork or rubber end gaskets when putting on an intake. Red Silicone on the mating surfaces and ends. I usually place the metal gaskets in, put the silicone & cork/rubber gaskets on, lay the intake in the valley, let it gel till tacky, then torque it down according to tightening order. 1/2 Torque first circle, then full torque 2nd circle.

I've never had a vacuum leak from any of the dozen or so intake I installed.