Feuling Endurance Beehive Valve Springs 6mm for Harley 2017-2020 Harley M8 - Stock Retainers

High lift/High load valve springs are required when using the Feuling 508 or larger Cam.

Fits: 2017-2020 Harley M8 Models

• 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 .650" cam lift; no machining or rocker box clearancing required
• 6mm valve stem
• Kits include: Endurance BeeHive® valve springs, lightweight 7° super Titanium heat-treated retainers, machined spring seats, seat shims, valve locks and a set of premium Viton® valve seals equipped with spring-loaded valve stem wiper system
• M-Eight specs: seat lbs./installed height; 134 lbs. at 1.375" (.405" lift), 127 lbs. at 1.405" (.435" lift), 125 lbs. at 1.415" (.445" lift), 121 lbs. at 1.435" (.465" lift), 116 lbs. at 1.455" (.485" lift), 113 lbs. at 1.470" (.500" lift), 109 lbs. at 1.490" (.520" lift), 103 lbs. at 1.520" (.550" lift), 226 lbs. at .970" (open height), coil bind at .920"
• 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 U.S.A.