Well, what I was doing was just asking another question about doing DIY porting for the experts to answer. Of course you want a nice transistion. Stock there's this rectangle shaped port that just all of a sudden leaves the head and has lots of room to expand when it enters the stock manfold... Actually, you know what? I'm just thinking of headers that have a round port that are attached to the head. the stock exhaust manifolds are also rectangles aren't they... >idiot< :-p Never mind... But then yeah, when you put on a header you'd want to open it up a bit to match the gasket wouldn't you?

And you know what? I just went out and took a look at the exhaust manifold that I had been using on my last engine, and there's evidence of the EXHAUSTMANIFOLD's ports being too small. As in the head port's opening was larger than the opening on the exhaust manifold. The opposite of what would be ok. :-\ Who know's what's going on right now in my motor. I was planning on swapping what's on there right now with the one I just looked at though. But now I'm on a stock B head AFAIK, instead of what could be a modified F head, so we'll see where I'm at when I start taking that stuff apart again.
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Kyle - VP of OVT Membership - www.OVTuners.org Portland/Corvallis, OR - 1968 142 - current setup: 71b20b SUs, m40, bigger list available upon request... ;)