Adjustable cam gears allow engine tuners to optimize horsepower and torque by adjusting camshaft timing. All adjustable cam gears are CNC-machined from AL7075-T6 billet aluminum. The 6-bolt design eliminates any chance of slippage, while the hard-anodized finish prevents premature wear. The timing marks are laser-etched and each offer over /- 10 of adjustment. Skunk2"s cam gear design has been proven on race cars in the most extreme conditions, and has proven to be the most reliable cam gear on the market.