Very cool link on head ports - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Very cool link on head ports by subsonic on 10 Feb, 2008 11:24
• I found this while surfing.  It is how to make exact molds of your intake and exhaust ports.  Pretty cool stuff.
  
  http://www.fordmuscle.com/archives/2006/12/MakingMolds/index.php