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I will have to disagree partially. A lathe to cut the bottom of the cylinder is a must. Any machine shop could do it for you pretty cheap. I started with the two articles noted and have built many engines using the information from them. They always run with anything comercially available. Is the last little bit of power hiding in the combustion chamber? Maybe. Can you build competitive engines without squish band/chamber mods? Yes. Will you go faster through an understanding of what and why modifications are made? Yes. These engines are no mystery. They have been pretty much maxed out due to design limitations for a long time. The data is out there. I always try to encourage people to learn and do things for themselves. Want racing to be more affordable, stop paying someone to do things that you can learn to do.