Black diamond or Tuftrided Big valve set for JS Beehive valve springs only
All JS valves are equiped with hardened stems and tips for wear resistance. Stock and 1.5mm oversize are black diamond. 3 & 5mm oversize valves are Tuftrided with hardened stems. All big valves with performance cams require re-angling of the guides to avoid valve clash. Contact us to order smaller Domni valves – same price. Beehive springs not included.