[Burnd]

Olddog:

The copper RTV is a temp solution but buys you time in a clutch. It'll cook away after a while. Been to that show.

I had the fumes problem on the passenger side of the car when i had a 351C in the car. The headers mated with a flange and I couldn't keep gaskets in the flange joint. It sucked fumes in on the passenger side; to the point where eyes watered.

I blew up the pictures of your sidepipes but i can't see where the slip fit joins. It "appears" it may be about 2" in front of the step-down pipe from the muffler. If it's not there, then I assume it's inside the 1/4 panel. That said; if its joined just in front of the muffler, I'd weld that SOB all the way around at that point and then recut the pipe at the center of the step down. You can have it slipped into an expander at the cut and make a new single 4" slip joint. Then you can buy 4" bands that bolt up tighter than a knats fanny, and the joints won't leak. The bolts on the bands face towards the frame rails and you can't see them tucked underneath. Mine are done that way and it allows me to change side pipe mufflers or run "shorty turnouts" too. Tubular Automotive Headers, Rockland, MA 781-878-9875 sells the bands and they're dirt cheap. Winter project though, but it would make life a lot simpler and the bands don't leak.

Bernie