Found this on AusRotary, which is always a good source of information. Those Aussies dont mind sharing information. ;)
Porting Thread (http://ausrotary.dntinternet.com/forums/viewtopic.php?t=47212&sid=d751bf82c7946bf8f4032cecb2a929fd)
Fish
Problem is Hempie is not an engine builder. Basically he has assembled together a group of google searches into one post. I even recognise some of the text he is using.
Far better to go to nopistons.com and search for posts by Lynn E Hannover. He builds race engines and is happy to share first hand advice on what works and doesn\'t with ports, including photos. Likewise Judge ITO has done a series on ports, focussing on the areas where inexperienced porters get the job wrong.
the judge ITO posts are well worth reading + take some time to drool over his RX-3 SP dragster :)