I just run a single gasket. I do find that you need to retorque your header bolts periodically. They do loosen up over time, especially after the first couple trips with new gaskets.
The same seems to be true of the header spiders. Mine always loosen up, no matter how much I tighten em. Just routine maintenance items.
[ June 01, 2003, 12:14 PM: Message edited by: Squirtcha? ]