CHEVROLET LS1-7 DUAL SPRINGS, RETAINERS, LOCATORS AND STEM SEAL KIT. LS KVSLS1D Performance Dual Spring kit. This kit features a Pac 1905 Dual Spring, Kelford Titanium Retainer, Steel Locator and Viton Seal kit. 160lb @ 1.800", 425lb @ 1.125", Coil Bind 1.020".