Brian Tooley Racing PLATINUM LS DUAL SPRING KIT - .660" LIFTBTR Platinum valve spring kits are dual spring kits, highly recommended when upgrading to an aftermarket camshaft. Each assembly was created to fill the need for high performanceand comes with quality dual valve springs, titanium retainers, locks, seals, and locators for stock or bronze guides. Build a better high performance cam with BTR valve spring kits! Order the material and stem seal color you prefer, and the model recommended for use with your