BTR GEN V .660" PLATINUM VALVE SPRING KIT - BTR-SK007/0560/BB When the Gen V LT engines came out, we knew our Platinum Springs would be right at home on the direct injection platform with the correct supporting parts. This kit is designed to be used with stock rocker arms. This is a drop-in kit for most stock-style guide Gen V LT cylinder heads. Excludes LT4. The kit includes the following: SP001-1 spring (qty 16) SR001-1 titanium retainer (qty 16) SL505060-1 (OEM powdered metal valve guide) locator (qty 16) VS LS seal (qty 16) VL78MMBL-.075-16 lock (qty 16) SS015-1 shim (qty 16) Spring specs are as follows: 155 lbs @ 1.780" 380 lbs @ 1.180" 400 lbs @ 1.130 Coil bind @ 1.070"