[blykins]

Because I can see the run-out in it on the dyno. It's very noticeable on the video of the engine on the run stand. Not sure if it's the pulley or maybe the crank snout has a little bend to it.

Looks like it's marked off in 90° increments as well, for setting valve lash. Don't set your valves like that, set them with the EVO method. It's much more accurate on large cams.