Actually, most of what I've learned about headers has been at both ED's site and S&S Headers' site. (http://www.ssheaders.com/header.htm)
I found the S&S sight slightly more informative on general header function, and I also liked their collectors more.
ED's site did help me realize the true value of equal length long tube headers. ED's site also explains more about the actual process of making headers.
Twisted, if it's not private information.. what are the specs on your headers? primary length, diameter... are the headers you made the ones on that purple 250 for your 64 in your site? Those pipes look really large.
Why did you make the collectors flat?
