[olredalert]

----Those headers appear to be original O.K.Kustoms. They were one of the original suppliers to GM (the main one). You could also buy them over the counter at many speed shops. The OTC sets didnt have the GM part #s stamped in them but were otherwise exactly the same!
----I cant say who made the flat-chamber sets, but they were predominantly pre-68. I found a set of them at Tracys years ago and they now reside on one Bill Towers cars.....Bill S