NITTO’s SR20 Rocker Stopper kit has been specifically developed to minimize the possibility of the valve train rocker arms jumping off their lifters, normally caused by an engine over rev or extended high rpm use as seen in various forms of motorsport such as drag racing or drifting. The rocker stoppers work by limiting the amount of travel the lifter end of the rocker arm can move thus reducing the possibility of this occurring. The problem is increased with the addition of aftermarket camshafts and if not rectified, will lead to eventual valve train failure and certain engine damage.