BTR .660" Lift Platinum Spring Kit

The BTR Platinum .660" Lift Dual Spring Kit, model SK001, is engineered for LS engines that use stock rocker arms. This kit is a direct fit for all 15-degree LS heads, encompassing a wide range of engines such as LS1, LS2, LS3, LS4, LS6, L76, L92, L99, LQ4, LQ9, L33, and LSA. It can also be fitted to LS7 heads with the addition of approximately .045" of spring shim, using part numbers SS015 and SS030. This comprehensive kit includes 16 SP001-1 dual polished springs, 32 VL7°8MM-1 locks, and 16 Titanium (SR001-1) or chromoly steel (SR001S-1) retainers. It also comes with 16 locators for stock or bronze guides and 16 VS LS valve seals. The spring specifications are as follows: 155 lbs of seat pressure at 1.780", 380 lbs at 1.180", and 400 lbs at 1.130". The coil bind occurs at 1.070". This kit is suitable for various applications, from daily drivers with mild camshafts to high-horsepower naturally aspirated strokers and turbocharged engines exceeding 1000 hp. It is crucial to note that this kit will not fit LS9 engines. For LS9 heads, please refer to part number SK006.