...assuming you're complaining about me, I humbly refer you to the 'Auto Shop Series' article,
"Header Science," in the November 1973-issue of
HOT ROD Magazine, pages 114-118 (wink,wink).
...from the dust-bin:
http://ecomodder.com/forum/163178-post22.html
...here's something recent from Prof. Richard Hathaway:
http://www.google.com/url?sa=t&rct=j...qO7gvQTH9kfoWw