Single springs can be used in higher revving engines, using a performance camshaft with higher lifts, and/or whenever high-ratio rocker arms are used. Just be sure that the spring is designed for the application being used. The benefits of a single spring with a damper are that the damper reduces harmonic vibrations in the valvetrain components. This in turn reduces valvetrain wear and/or component failure. Having the damper also offers increased safety in the event of a broken valve spring, as well as increased spring pressures, to eliminate valve float at high rpm, while reducing coil bind issues in high lift applications.