BLACK NITRIDE VALVES - Brand new valves but not the new style BC polished with dish face. Blowing out existing inventory. These are stainless steel, black nitride finish with flat face. While supplies last. All sales final. ndercut stem above the head area not only reduces overall weight for extended rpm potential, but also significantly improves air/fuel flow in and out of the combustion chamber. Every valve is fully machined and features a swirl polished finish under the head.