Adjustable cam gears are perfect for those looking to adjust the timing on their cars without having to get under the valve cover, disassembling the engine or dealing with onboard electronics. These allow the user to retard and advance the timing on their engine by ten (10) degrees in either direction. These cam gears are CNC machined form 6061-T6 billet aluminum. They also use laser etched marks for precision and ease to read. Something that makes this Cam Gear unique is the fact that Brian Crower uses ARP Grade 8 hex bolts for maximum strength.