They are D-ports!!! The guy sounds like a typical Chevy guy. He probably thinks that chevy & pontiac motor are the same. There are only 2 ports, a Round port header & a D-port header. He may also be going by the shape of the end ports on a D-port head that are oval shape. But the 2 center ports are a " D " shape & that is why they are called D-ports & not oval. Tell him to grab a Mr Gasket #550G header gasket off the shelf & you can show him the center ports shaped like a D
I do hope he is looking them up in his header parts book & not going by his memory. Because if he was looking in a book for a 67' firebird, it would ask for std D-port or round port for that body.
What brand of header are you looking for? Maybe PY would have them & save the guy at the speed shop a little guess work.
Ron
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