Hey guys, this is probably a dumb question but i have heard different instructions. I am seriously looking at buying new cams and installing them this winter. Do I have to pull the heads off to change the cams? I am going to have to change the springs with the grind that i want too. I have longtube headers so i really don't want to pull the heads if i don't have to. I have heard all that you have to do is to pressurize the cylinders with air to keep the valves in place when changing the cams and springs. Any ideas?