MAXIMUM Header Gasket Thickness?

Cool, I saw a few on the summit site earlier today. Not many specs listed as far as thickness. I can see where stacking 2 gaskets together could be a problem especially if I had a leak. These headers take enough patience as it is. The copper sounds like a good option plus they are reusable.

Here's the tube I was talking about. This was on the car in a previous picture posting from the Fall Fling. Looks like he has a little bit more clearance than I do. I should have pictures tomorrow of mine.