I know this is a question that have been asked several times but I'll ask again. How many rotations have to be made before the timing chain marks align with camshaft and crankshaft marks again. I ask cause I just set timing and after several spins the marks never aligned back up even though the crankshaft and camshaft bolts did seem to be at 60 degree after tdc. Want to insure everything is ok before I try to start car.