BC adjustable cam gears deliver the easiest way to dial in more horsepower and/ortorque without getting underneath the valve cover, disassembling the engine or dealing with onboard electronics. BC gears are CNC machined from aerospace grade,6061-T6 billet aluminum for ultimate tensile strength. Easy to read, laser etched face features micrometer stylemarkings for precise adjustment (up to 10 degrees in each direction) and quick tunability. Each hub is held down by four Grade-8 hex boltsfor maximum clamping ability. Hard anodized finish prevents premature surface wear.