[Tony Radford]

I went back and re-torqued all the header bolts and the backfiring stopped. Later in the day, I took another joy ride and some of the backfiring had returned. After the exhaust system cooled, I went through and was able to pull a tad bit more on two or three of the bolts. Has anyone else installed copper exhaust gaskets? I'm wondering if I will always have this problem or if they will eventually pull up and stay. It is amazing how little it takes to create a backfiring situation.