What are the stock cam specs (Lift and duration). Also If I go with a really mild cam just a little more duration to keep the power until redline do you guys think I'll need new shims? I'm shooting for 500rwhp with an hx-35 right now and money is tight, I'm going to get real cams over the winter but wanted to get the stock ones reground for now to give me some more up top power. When you do different cams is it the duration or the lift that throws of the clearances?