PRW 0335021 1.6 x 3/8" Self-Aligning Narrow body Aluminum Rocker Arm for Chevy 262-400 1987-00, Vortec Designed to meet the demands of most high-lift roller cam shaft profiles Specially machined to accommodate larger valve springs and retainers CNC machined pushrod cups and heat-treated Cr40 roller tips Internal oiling system for long lasting performance PRW RockerLocs included