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Just like the links in the chains of your old GT, Mach 1, or Hutch Trick Star, the timing chain features a darkened link, while the cam sprocket has a mark on it. If you notice in this image there is an L and a R. From what we’ve gathered, these sprockets are interchangeable. Therefore, if you install one on the left side of the engine, you line up the darkened link to the L. If you install the sprocket on the passenger side, or right side, of the engine, you’d line up the darkened link with the R. There’s also a tensioner for the cam sprocket chains.