GM's LS-Series V-8 engines are the most popular and fastest growing performance and racing powerplants since the original small-block Chevy. These plentiful, versatile engines have also spawned a huge and rapidly expanding aftermarket of power-increasing LS-designed products. One of the most power-rewarding ways to increase HP, torque and RPM in any LS V-8 is by installing a Lunati roller cam. This becomes the foundation for building a powerful LS engine that fully utilizes all the capabilities of aftermarket power enhancing products. Now Lunati offers LS enthusiasts the opportunity to take that cam change to extreme power levels with Lunati's new LS Valve Spring Kits. Three new Lunati Dual Valve Spring Kits are available for GM LS engines. Each kit includes everything needed to maximize horsepower, torque, RPM and durability for mild to extreme applications. Each kit includes a set of Lunati Signature Series, tension-matched, Chrome Silicon Dual Valve Springs (Pt. No. 73925). The three kits come with either 4140 chrome moly, light weight tool steel Valve Spring Retainers or titanium Valve Spring Retainers, plus Lower Spring Locators, Machined Steel, 70 Valve Locks and Viton steel-reinforced Valve Stem Seals, for positive oil control. Pt. No. 73925K1 features Chrome Moly, machined steel, heat treated retainers. Pt. No. 73925K3 features lightweight, machined Tool Steel retainers. Pt. No. 73925K4 comes with Lunati's premium Titanium Alloy retainers, the lightest, and strongest available. Each of the three kits features Lunati's finest Chrome Silicon, precision wound, micro-peened, heat-set, dual-coil valve springs. These 1.306" O.D. springs provide 153 lbs. seat pressure (measured @ 1.810") and 400 lbs., open load (measured @ 1.150"). These competition-proven valve springs are designed to accommodate aggressive cam profiles with valve lifts of up to .660".
