PAC 1335 EXTREME DUTY DUALS LIGHT WEIGHT VALVE SPRING FOR LS ENGINESCALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. O. D. Outer I. D. Outer Damper I. D. Inner Installed Height (Valve Closed) Open Load (Valve Open) Spring Rate Max Coil Bind Max Lift Titanium Retainers Steel Retainers Spring Seats Spring Cups Price 1. 3 0. 9 No 0. 616 250 @ 1. 800 860 @ 1. 050 813 0. 985 0. 800 PAC R532 PAC R432 N A PAC S128 N A High Rate Dual LS Spring used for Drag Racing $563. 53 American made chrome silicone double drag race spring