I know there has been many other posts regarding this but I feel confused still. The part I'm not grasping is everyone says remove the valve covers and you can move the cylinder to TDC and even fill the cylinder with rope to help hold the valaves, got that part. This is where I'm confused. Do the cams stay bolted in while I go through all cylinders? If they dont how do you keep the timing correct when rolling the motor over to get to the other cylinders?