Feuling Endurance Beehive Valve Springs for Twin Cam 1105 Machined from premium-grade hi-tensile chrome silicon single conical ovate wire Shot-peened with specially processed thermal heat treat and super NexTex finish for fatigue life needed to exceed high demands of V-Twin engines Use a much smaller and lighter weight retainer to reduce valve weight and create quicker rev and smoother motion Direct bolt-in replacement up to 650in. cam lift; no machining or rocker box clearancing required 7mm valves Kits include: Endurance BeeHive valve springs, lightweight 7 degrees super Titanium heat treated retainers, machined spring seats, seat shims and valve locks and a set of premium Viton valve seals equipped with spring loaded valve stem wiper system Spring pressures are 190 lb. at 1.725in (.575in lift), 185 lb. at 1.785in (.635in lift), 160 lb. at 1.800in (.650in lift), 375 lb. at 1.150in and coil bind at 1.100in.