I have watched that guys videos in the past, problem is he never tells you what they flow before and after that work. Now I know I don't do that either but if I am doing them for someone else I flow the heads. Here is something you can do Jeff that a head porter told me about. He told me that what they did in that area is to drill out that bolt hole, then press in a brass sleeve with some sealer and grind away. This way when they torque down the head it does not crack in that area. I guess head porters do that all the time when they go for max flow.