Books are nice, pictures are too but until you get you hands dirty and own a flowbench you are pissing in the wind. There are days when I grind and flow test a given head 10-15 times in one day. Tim Bowman Bowman Performance (a very accomplished head porter) and I were talking just last night about "short turn work and how your fingers play a BIG part in getting it right. I can honestly say I keep a pen and paper on my night stand as I often get up during the night and sketch something that came to me in my sleep. I will then apply it the next day to see if it works. I had to teach myself to try to visualize a port as a 3D object and port molding helped big time. Its great to be able to study something from every angle possible.