660" Dual Valve Spring Kit SS030 SS015 for LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 4.8 5.3 6.0 Replace Part Number: SS015, SS030 Fit for General Motors LS-based small-block engine:LS1, LS2, LS3, LS4, LS6, L76, L92, L99, LQ4, LQ9, L33, LSA-4.8, 5.3, 6.0 Feature: 1. This is a drop-in spring kit for all 15 degree LS heads including LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA, etc. this kit will also fit LS7 heads with approximately .045" of spring shim (part numbers SS015 and SS030).2. This kit will not fit LS9 engines, please use part number SK006 for LS9 heads.Specification:1. Max Lift: .660"2. Spring specs are:155 lbs @ 1.780"380 lbs @ 1.180"400 lbs @ 1.130 Coil bind @ 1.070"Content:16X Dual Polished Spring32X VL7骼?MM-1 locks16X Chromoly steel (SR001S-1) retainers16X Locators for stock (SL505060-1) or bronze (SL565060-1) guides16X VS LS valve seals