Motor State Distributing has set the pace for highperformance automotive components for racing, street, and offroad use. We offer wide range of quality auto accessories.Manley SB Chevy Severe Duty 1.625 Exhaust Valve Features. Small Block Chevy Severe Duty 1.625 in. Exhaust Valve. Variety of styles for every type of accessorySpecifications. Size 1.625 Diameter. Stem 0.3415. Length 5.565