Lunati now offers complete ready to install kits featuring matched performance valve springs, spring retainers, locators and machined steel valve stem locks for Harley-Davidson® Evolution Big-Twin® and Twin-Cam® V-twin engines plus the many “Evo clone” engines found in aftermarket bikes. Lunati valve springs are made from finest quality chrome silicon spring wire, precision wound and heat-set for tension retention and long-term reliability. Lunati also offers its premium quality, Signature Series Ovate Beehive coil design springs, for even greater performance. Lunati valve spring retainers are available in both precision machined, heat treated 4140 steel alloy and lightweight, CNC machined 6AL4V titanium alloy. These titanium retainers are the lightest, strongest retainers available. Premium quality steel alloy is precision machined and heat treated for strength and wear resistance to form our spring locators. Lunati valve stem locks are precision made from heat treated, machined steel, providing extra strength for this critical component. For specific application information for your engine contact Lunati’s hands-on, highly experienced tech staff.