No sealant necessary, but the paper gaskets are thick as hell. Even if you use the .015s available from other sources, .030 stack up isn’t insignificant. The first question for me is CAN you run them, and do you want to cut your intake .030-.060 if you cant?

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street