Advancements in valvesprings over the past decade have been massive. Thirteen years ago, the valvespring required to deliver seat pressure with the valve closed was a massive triple-spring setup (right). Evolution in alloys, treatments, and coatings has allowed the use of dual springs that deliver the same control over the valvetrain. These COMP Cams valvesprings are made from Pacaloy material, which is created in a process that results in steel that is more pure. They are impact treated and the surface is chemically enhanced to remove imperfections. These steps reduce surface stress, providing greater durability.