The PowerGlide ™ Steady Roll Tappets for Harley Davidson FX models from the years of construction 1985 to 1994 are a high -quality solution to optimize the valve drive. These starks use a specially developed bronze letters' socket that replaces the traditional conifers. This construction improves reliability and extends the lifespan of the components. The precise production of this stark enables a quieter operation compared to standard models.