Kits include KPMI® or equivalent valve spring kit, a full set of Black Diamond™stainless steel standard size valves and are black nitride coated, H.T. (Heat Treated) steel valve keepers and valve stem seals (where applicable) for engine applications listedBlack Diamond™ valves are one piece forged stainless steel that are fortified by a special German process to improve wear properties and reduce frictionWhite Diamond® valves are CNC machined from one-piece forging of either EV8 stainless steel or Inconel-751 and are hard chromed with 360° anode to produce a hard chrome finishCompatible with leaded and unleaded fuelsSold as complete kit for one engineMade in the USA