First thing is to clean up the heads and prepare them for disassembly. Here Rocco Acerrio uses a valvespring compressor to remove the springs. After the springs are compressed, it’s just a matter of removing the two valve locks. With the locks out of the way, he slowly released the pressure to remove the valvesprings. Then the entire valvespring assembly can be removed, including the retainer, stem, and the spring seat.