The original point, I take it, was to determine if LJ's crank and cam are in the correct relationship regardless of where they are at at any given time. The only way to know this, as I understand it, is to initially line up the crank and cam timing marks with respect to the idler. My point was to give an idea (really, the exact idea) as to how many turns one would have to rotate the engine before the marks once again line up. Assuming gear timing is correct, and the crank mark is lined up with the idler mark, you are either right on the marks or 49 turns of the crank away from them. When you are 49 turns away, the cam gear mark will be 180 deg. away from its rightful location opposite its corresponding idler mark. If you are not timed correctly at the gears, you might learn this by turning the crank over 98 revs and seeing that the marks never all align, but that would be ridiculously tedious versus just repositoning the idler and cam.
Richard L.