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if not timing marks
Make A Top Dead Center (TDC) timing mark.
See this webinar for the details on how to find TDC:
https://www.hpacademy.com/previous-webinars/175-how-to-find-true-tdc-top-dead-center/
It might help is you said which engine it is, and do you mean just the crankshaft TDC mark, or any marks on the cam' gear(s)?