DescriptionGenuine Cummins 3931623 tappet/lifter set of Twelve (12) for the 6BT enginesCummins Diesel Engine Valve Tappet / Lifter / Follower , ’89-’98 Dodge 5.9L 6BTGenuine Cummins tappets for the 6BT engines. When replacing the camshaft on the 6BT Cummins engine make sure to replace the tappets. Using old tappets on a new camshaft could cause uneven ware on the camshaft itself. These are sold individually.