Dont worry , if youve set the cam position , or pinned the cam =ie hole above flat surface of head , then with the chain off you just rotate the outer gear(intake cam) to the right all the way till it stops, then install chain at that position=ie retarded positiion, , if your removing head after its been run ,or you have rotated the engine clockwise just put paint marks , when everthing is aligned , but dont rotated engine backwards or intake cam will not be aligned, always rotated clockwise till your marks always align per instructions, and if your chain is stretched or head milled its going to off a little