Andrews, Big Twin cam gear. Undersize (black) - 48-65 Panhead; 66-E77 Shovelhead (NU) 3150 The trick rear plate allows

The trick rear plate allows you to install the cover in horizontal or vertical position

Intermixing different brands may cause premature failure

Note: Below mentioned valve stem diameters are for reference only

damage or frustrations

Andrews, Big Twin cam gear. Undersize (black) - 48-65 Panhead; 66-E77 Shovelhead (NU) 3150 The trick rear plate allowsBlack, undersize. Crimp on installation on the camshaft. Used to correct backlash (free play) between the cam gear (on the cam) and the pinion gear (the smaller drive gear). Too much backlash will result in clicking, not enough backlash will result in a 'whining' sound. To correct backlash you can either use smaller or larger pinion gears or smaller or larger Andrews cam gears. Note: See 503768 (. 108") and 503769 (. 105") cam gauge pins to measure