COMP Cams offers two types of kits to replace stock valve train components for more useable horsepower and a higher rpm operating range. The first is our RPM kit, which includes pushrods, valve springs and retainers. The second RPM plus kit has the same components but also includes lifters allowing for a complete valve train buildup for a new cam. PartNumber : cca54050 Description : RPM Valvetrain Upgrade Kit; Incl Magnum Pushrod PN[7638]; Valve Spring PN[26915]; Steel Valve Spring Retainer PN[774]; Title : 54050 Pushrod, Spring, Retainers Kit, GM LS1 2006 Chevrolet Trailblazer SS V8.5967cc Engine Components::Engine Uncategorized