I am going to be replacing my valve seals and springs and I would like to do it with the heads on the car. My springs have an inner and outer spring. I wanted to know if anybody has done this before. I have stud rockers so I was going to try and use a chevy spring compresser, and I will be able to fill the cylinder with compressed air. I am going to try to break the keepers loose with a socket and hammer, but I have never done that with the heads still on the car before, will it work. Any ideas would be great.