I have searched and found no responses in this forum. I need to know how to change the valvesprings without removing the heads. I am presently driving the car with a wiped-out cam lobe. Today I heard a noise that sounded like maybe it was a piston hitting a valve, or maybe the valves were sticking and slamming back into the seats. Should I cease driving it? Its my only car and the new cam is coming in in a week.