Blacktop exhaust port size

[Grrrrrrr!]

If anybody has a blacktop 20v head handy can you measure the diameter of the exhaust ports for me?

And do the blacktop extractors match up perfectly to those ports? if someone could measure the ID of the header pipes that would be great too

[Caveman]

Should be just under 1 1/4 nominal size

If ur gonna make headers make them 1 1/4 and put the dam at the bottom