Brian Crower Adjustable Cam Gears BlackAdjustable 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 from 6061 T6 billet aluminum. They also use laser etched marks for precision and ease to read. Something that makes