How old of engines? If talking about real old, like before the days of timing lights, I would go by the way the repair manuels indicate. Even if they have timing marks and indicaters, they weren't intended for use of a timing light while engine is running. The marks have to be precise and a certain degree before top dead center for timing lights to work. Back in the day, marks may of very well only indicated top dead center if it had any marks at all. My 2 cents.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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