I too subscribed to the detailed porting guide
Never ported heads before. Got some D3s and a practice head to torture. Using the detailed instructions and pictures on Scotts web site program, I was able to finish a set of D3s on the exhaust side and just some general bowl blending on the intake side.
My machine shop guy was impressed and offered to throw some work my way and I said no thanks,. This really makes me appreciate what it takes to do this time consuming job. I saved some money and learned alot as well.
His initial one time fee is more than worth what you get out of it. I bought a basic set of porting bits and some sanding drums. Didn't get to flow test them as I was pressed for time and his shop was busy but this is a good teaching tool that is being offered here by the "Mad Porter". Sorry didn't mean to ramble but it is what it is. Warren