Feuling Beehive High Load Valve Springs For Harley Twin Cam / Sportster Features Feuling has developed new high load premium performance BeeHive valve springs for steep ramped large lift camshafts These valve springs are made from premium stress relieved conical ovate wire with a nitride surface heat treatment, shot-peened surface enhancements along with a Nano Peen polish They have an extremely high level of fatigue life and are designed to handle the highest demands of performance engines Dyno proven and track tested Kits include: Feuling High Load BeeHive valve springs, lightweight 10 Titanium retainers manufactured from special Ti-17 alloy that are micro polished for enhanced fatigue life, machined heat treated chrome moly spring seats and valve locks and a set of premium Viton valve seals equipped with a spring loaded valve stem wiper system Spring pressures are 215 lb. at .585 lift, 200 lb. at .635 lift, and 185 lb. at .685 lift 10, 7mm valve stem with stock triple keeper groove