I have been trying to modify engines by myself, with out guidence. They end up being fried. (literally, they pop!!) How do you guy measure your cuts (leangth+depth)? Is there a tool? Is there a book that I can get that explains the correct process. I want to learn how to do this. It is very interesting to me. Please help. (Most of the engines that I modded were really really cheap. I don't have a lot of cash, but you have to start some where.)

Later,
-Dust