How much can I shave the head with a stock cam? I am building a d16z6. I am also interested if a lighter flywheel will help in horsepower. I run a 94 civic on a dirt cirlcle track, 1/4 mile. Would it hurt if I run a little bigger cam with the head shaved and run the stock pistons. I am trying all options on a budget. Please someone can you help me with some options.