Buzo V-Thunder Comp Cams XLCaracteristicas: Features an oil metering design that provides uniform metering throughout the entire rpm range Rollers and axles are manufactured from high carbon chromium bearing quality steel, which is through hardened for improved wear and load carrying capability, and the pushrod seat is carbo nitrided Each unit is 100% tested for proper function HY REV hydraulic roller lifter features internal hydraulic check valve, which allows for higher rpm