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. NOTE: SOHC prices are for one (1) cam gear, DOHC prices are for two (2).