COMP Cams pivot balls are a good upgrade for stock components. These are replacement pivot balls for COMP Cams Magnum roller tip rocker arms. Designed for ultimate strength and locking force. High Energy and Magnum polylocks are best for moderate lift and spring pressure applications. Hi-Tech polylocks work well in all high end race applications. The stud girdle polylocks are precision ground for minimum run out and tapered for extra strength in the locking area.