A direct bolt in replacement up to 650 in. lift camshafts no spring seat machining required; machined from a premium grade hi-tensile chrome silicon single conical ovate wire, shot-peened with a specially processed thermal heat treat and super NexTex finish to give these valve springs the needed fatigue life to exceed the high demands of V-Twin engines from stock to performance.

• Uses a much smaller and lighter weight retainer, which drastically reduces the valve weight creating a much quicker revving and smoother motion than comparable dual valve springs; direct bolt-in replacement up to 650 in. cam lift no machining or rocker box clearancing required
• Eliminates valve spring separation, maximize stability, reduces valve-train noise and harmonics
• P/N 481847 for 10 Degree 5/16 in., includes valve stem, keeper grooves and .530 valve guide
• P/N 481848 for 7 mm valves with stock keeper groove

• Kits include Feuling Endurance Beehive valve springs, lightweight 7 Degree titanium heat treated retainers, machined spring seats, seat shims, valve locks and set of premium Viton valve seals equipped with a spring loaded valve stem wiper system