Intake Manifold Oil Leak

I use the high performance gaskets that have the metal pan, and 4 fiber gaskets. I glue the fiber gaskets to the pan. One on intake side. One on head side. Then I use rtv to seal the head to fiber gaskets, and the same for the intake. Not sure of the thickness. You can use a feeler gauge to try to get an idea of how thick the gaskets need to be. I got mine from Fel-Pro.