my suggestion would be-go to advanced auto's website-they now have SERVICE-HOW TO manuals-on line!!
..register with them,and what kind of car you have,and for many things-i don't know for SURE they would cover the timing marks,but that sounds like a fairly common question,as you're supposed to change them every 50/60,000 or so...itd worth a try!!
Source: www.advanceautoparts.com
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