Engine Valve Spring Compressor On-Engine Direct Mount Fits LS1, LS2, LS6 GM Engines Black Steel ProformThis LS valve spring compressor is compact and is activated with normal hand tools, and takes up almost no space in your toolbox. It will cut valve spring removal and replacement time to around 1 hour. And, it is guaranteed to get the job done as easy, if not easier, than expensive compression tools. Quick tip: Instead of stuffing rope through the spark plug hole to prevent your valve from falling, use the Proform Air Hold Adapter Set with an air