Rocker Lockers Twin Cam ~ End Ticking Noise Replace The Rocker Base Gaskets Features: The rocker arm shafts have a notch in them that the bolt is supposed to butt up against, locking the rocker arm shafts in place. However, the bolt hole is too large, leaving a gap. This gap allows the shaft to rotate and hit the bolt, causing a tick. 1.The Rocker Lockers eliminate the gap, locking the shaft from turning and striking the bolt, eliminating that annoying tick. 2.The Rocker Lockers also center the inner rocker cover so that it is always located in the same position eliminating different wear patterns on the rocker arm/valve and a better alignment of the pushrod in the holes. 3.The Rocker Lockers are tapered so that they lock themselves in and wedge the bolt/shaft in place. It is recommended to replace the rocker base gaskets. This is the gasket that goes between the Rocker Cover Inner & the head on each cylinder. Note: If you ever need to remove the lockers, just use a punch and tap them out, they are usually reusable. Package content: 4x Brass Precision Tapered Bushings 2x O-Rings 1x Washer &1x Nut for installation 1x Teflon Centering Tool