This easy-to-use valve spring compressor tool for LS-1/LS-6 or 1955-98 small block Chevolet V-8 including LT1 heads will cut valve spring replacement time to under 1 hour. It's a great tool to have when changing to a higher performance cam & valve spring set-up in your Camaro, Firebird, Corvette or Truck. A must for any home garage or professional shop.