Yes. The 1 1/2" diameter round tube goes through the flange and is stretched into a rectangle (exhaust port size) and bent over on the inside of the flange on the mating surface. I was in a speed shop today and noticed that some of the V8 headers had fairly wide flat area...about 1/4" inch which would give a nice tight seal I'd think. Mine goes from 1/8" to 1/4" and when I lay the exhaust gasket on it, there are a couple places where there is barely ANY overlap which accounts for the previous exhaust leak.
