• 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
• FEULING® BEEHIVE® valve springs use a smaller lighter weight retainer which drastically reduces the valve weight creating a quicker revving and smoother motion than comparable dual or single valve springs
• Valve springs are a direct bolt-in replacement, no spring seat or rocker cover machining required up to 0.565” lift
• Springs will accommodate over 0.600" cam lift, but will require spring seat pocket machining on the cylinder heads to set correct spring open height
• Smaller lighter weight retainers which drastically reduce the valve weight creating a quicker revving and smoother motion than comparable dual or single valve springs
• Eliminate valve spring separation, maximize stability, reduce valve-train noise & harmonics
• Kit includes: matched set of Feuling® High Load Beehive® valve springs, Ti retainers, machined spring seats, seat shims, valve locks and a set of premium Viton® valve seals equipped with a spring loaded valve stem wiper system

Seat lb/Installed Height

• 151 lb @ 1.475" (0.485" Lift)
• 144 lb @ 1.498" (0.508" Lift)
• 143 lb @ 1.501" (0.511" Lift)
• 140 lb @ 1.511" (0.521" Lift)
• 124 lb @ 1.562" (0.578" Lift)
• 120 lb @ 1.582" (0.592" Lift)
• 304 lb @ 0.990" open height
• Coil Bind @ 0.945"
• Recommended for +0.540” lift camshafts
• Feuling® BeeHive® valve springs must be installed at the correct open height, matching max lift to the open height spec of the valve springs
• Made in the USA

Warnings

• Only recommended for large lift camshafts and race style engines as these valvesprings if not set properly will create extreme rocker arm deflection.