Assault Racing stud mount aluminum rockers are specially machined to allow for larger springs and retainers with full-cage friction reducing needle bearings for added durability. The nose rollers and shafts are Cr40 steel, heat-treated and hardened to minimize the wear that naturally occurs between the roller tip and the valve stem. Designed to meet the demands of most high-lift roller camshaft profiles. Specially machined to accommodate larger valve springs (1.45") and retainers. SAE-52100 Full complement precision needle and cage roller bearings. CNC machined pushrod cups and heat-treated roller tips. Clears most centerbolt covers (depending on the inside of the cover). Applications: 396 (1966-70) 402 (1970-72) 427 (1966-69) 454 (1970-90)