Tim,
Good to see you around, it's been a long time!
Kevin,
I heard that a while back & half-**** tried it on a set on skanky Hedmans. I think it might work on regular cheap headers....these Hedmans were the 14 gauge "towing" HD headers. I ended up kinking two tubes, & then the two "flanges" started to form an angle. I ground the holes larger to accomodate the bolts & got it started, but I guarantee it would have leaked like a sieve.
I think it would have worked better with a set of 16 gauge headers & a torch. If I run across a cheap (i.e. free) set I'll try again.
I sort of straightened the Hedmans & sold 'em for a few more $$$ than I paid. Gotta love Chevys.