Racing Head Service (RHS) 1605-8 Features: Cast 8650 Chromemoly Steel Body Arched Web-Like Design Increase Strength And Rigidity CAD/FEA Design Black Oxide Exterior Helps Prevent Corrosion Increased Retainer/Spring Clearance Lifetime Guarantee On The Rocker Body Height: 13.00 Width: 4.00 Length: 3.75 Weight: 4.66 lbs