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Hi Ron
The square nut is installed with a swaging (sp?) tool, it's sorta like the reverse of a crimp, it gets slightly expanded into the manifold. The dealers should have the tool for installing the nut, if yours is wrecked, or you CAN use a regular nut on top I suppose.
To remove it, are you saying the nut is spinning when you say "no luck"? Usually you can get the square part to stop spinning in any number of ways: wrench, vise-grips, or jamming a screwdriver or chisel to one of the flats and the other side of the chisel/screwdriver to any handy "jammable" surface like the manifold itself, maybe, but these are thinwall castings I believe, so be careful of that.
Gilly
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