This Dual Valve Spring Kit for LS engines includes carefully matched Dual Valve Springs, tool Steel retainers, locks, Seals and spring seats. With a .660" maximum lift, these COMP Cams Dual Valve Springs for Race Applications are manufactured from Super Clean™ wire and subject to extensive quality control testing to deliver a valve spring assembly with superior strength, durability and valve train stability, no matter the application. The dual spring design creates a stronger valve spring that can easily handle the increased lift found in extreme stress applications. COMP Cams Dual Valve Springs exceed the expectations of today's engine builders and racers.