Cylinder Head Flow Bench?

Go here , join this forum, it's all about flowbenches.
http://www.flowbenchtech.com/forum/
Also David Vizards book on porting could be cut down to about 20 pages of real useful information, a lot of that information has been posted on the net in various tech magazine articles. There is also some good porting info on this site.
Here is a DIY design to look at...
http://dtec.net.au/Flowbench Design Guide.htm