This tool is used to aid in the frustrating task of getting the correct pushrod length to optimize rocker arm geometry. It can be used in anything from a stock GX/Clone to a Big Block Briggs Engine. It includes the adjustable pushrod along with a carbide drill-driven tool for squaring off the ends of the pushrods after they are sized and cut. This eliminates the use of a lathe to square the ends properly. Use this tool with our universal Chromoly Pushrod kit to give your engine a correct and stable valvetrain.