The seals go across the front and back of the intake. Most mechanics throw them out and use Permatex Form-a-gasket in their place. I think you guys are talking about the gaskets. You can solve the problem by coating your gaskets on both sides with Permatex. Also don't tighten one side first then the other. Find the torque setting for your engine and tighten each bolt gradually with a torque wrench. The same as you would with a cylinder head.