NEW 5.7, 6.1, 6.4 Generation 3 Hemi Rocker Shaft Collars. Complete set of 16 Brand New Billet Aluminum Collars. These Collars are designed to keep the Rocker Arms in perfect alignment with the Valves and Push Rods. These Collars are a must for all High Performance Generation 3 Hemi Valve Trains. Please state which motor you are ordering for.