S&amp,S Cycle 570 Gear Drive Easy Start Cams Complete Kit 106-5221 S&S .570 inch lift cams are designed for 88 to 96 inch engines with compression ratios between 9:1 and 10:1. This 570GE Gear Drive Easy Start cam is designed to greatly improve valve timing accuracy by eliminating timing chain lash and Easy Start Cams allow stock starter to start any engine. Complete kit includes cams with inner gears and installation kit. Intake Opening (degrees): 20 Intake Closing (degrees): 40