Building a serious small block Chrysler (273-360)? These COMP Cams Ultra Pro Magnum shaft mount rocker arms are a top-tier upgrade. With a 1.5 ratio, they're machined from 8650 chromemoly for incredible strength and reduced inertia. They feature oversized trunions, needle bearings, and hardened roller tips for smooth, reliable operation at high RPMs. The unique oiling system keeps everything lubricated, and the black oxide finish fights corrosion. Designed to clear most valve springs and retainers, they're a bolt-on performance boost for street or strip. Part number 1622-1. If you're looking for maximum valvetrain stability and power, these rockers deliver. Perfect for enthusiasts who won't settle for less than the best.