Good luck getting info out of TTI for anything that’s not already in their catalog - that’s my experience anyway – twice!
FWIW, at 3-4 years and counting, I have no header gasket leaks. I tossed the supplied 2 ¼” nipples and welded 2 ½” pipe directly to the supplied collector flanges instead. It’s kinda silly to make a header for a bigblock and then supply hookups for 2 ¼” pipes!
Swim over to the Drydock and read these 2 threads of mine, they should help you some. I’ve done 2 X-pipes on C-bodies, and I’ve always wanted to make a jig and make some nearly-bolt-in C-body X-kits but I don’t have time to develop it. I’d need to make a good-sized jig and make a couple of sets to get confident on the consistency -- meanwhile my mandatory car work would standstill. I did find a place that does reasonably-priced CNC bending, but you have to send them a pattern.
I have no time!
Post some pics of where the GV falls in relationship to the current exhaust and crossmember, etc.
The Hedmans actually have pretty decent angles coming out of them for home-built pipes, I think I mentioned that in one of those threads.
http://www.cbodydrydock.com/forum_viewtopic.php?6.22000http://www.cbodydrydock.com/forum_viewtopic.php?6.22001
