Universal LS Valve Spring Compressor ToolGM LS-Series EnginesBillet Aluminum with Steel Fittings This easy-to-use LS valve spring compressor is compact, activated with normal hand tools, and takes up almost no space in your toolbox. Simply mount it to the cylinder head and compress two springs at a time. It will cut valve spring removal and replacement time. Brightly anodized billet aluminum will make it easy to find in your tool box, and reinforced with steel fittings for lasting durability.