The LT1 Pacesetter headers were not a copy of Hooker. I think the JetHot's were a copy of Hooker. The Pacesetters I put on my 96 SS were very nice headers with some nice thick flanges. The welds on the inside of the tubes/flange area was a little sloppy in a couple of spots but so are all the other headers. I grind down any sloppy weld on all the headers I've ever had.
Oh, and the word of the day is "flange"!
