Nissan RB25DET exhaust valves. Solid lifter conversion on an OEM hydraulic lifter engine. Supertech NEVI-1052/SL. Inconel material. Head Diameter: 30.65mm (+1mm oversize) Stem Diameter: 5.94mm Length: 105.8mm. Sold as a set of 12. ***need to figure out what KCF bucket will suit and what base circle cam****