Adjustable Cam Pulley Volvo 8v / 16v Adjustable Cam Pulley for Volvo 8v and Volvo 16v. Notice that you need two cam pulleys for the Volvo 16v engine. Nuke Performance Adjustable Cam Pulleys allow for fine tune adjustments to cam timing to maximize performance. Adjustments can be made to tune an engines power band to an optimum RPM range for Different application. The pulley is hard anodized for long life and are CNC-machined from 6082 aluminum alloy. Three M6 bolts are fastened with helicoil inserts for long durability. There is also hard washers to make sure the pulley do its job on the racetrack or drag race and do not lose your tuned settings even under hard pressure.