Dual springs are highly recommended when building higher revving engines with medium to high-lift camshafts, and/or whenever high-ratio rocker arms are used. Like the single spring with a damper, they reduce harmonic vibrations in the valvetrain components. This reduces valvetrain wear and/or component failure. Dual springs increase safety in the event of a broken valve spring. They also offer even higher spring-pressures, which eliminates valve float at high rpm, while reducing coil bind issues in high lift applications.