HRB In Car Valve Spring ToolService or Replace valve springs without removing the cylinder head with the HRB 1JZ 2JZ In Car Valve Spring Tool. Specifically engineered for the TOYOTA JZ engine family, this professional grade tool allows you to replace valve springs easily, efficiently, and safely, saving countless hours of disassembly and reassembly work. Developed and tested in our high performance engine building environment, its a must have addition to any serious builders