Uprated Double Valve Springs Vauxhall C20XE Z20LET C20LET X14XE X16XE X20XE Swiss silicon chrome vanadium spring steel. Heat-treated and shot peened for high RPM. Computer-aided design for low stress levels with very low Harmonics with excellent structural memory Set of 16 Fitted length 31.5mm Rate 208 lbs Inner spring fitted length should be 29mm with 2.5mm step Seat Pressure 68 lbs Maximum Valve lift 11.40mm Crushed height 17mm
