Here is a quick video on which is the correct timing mark to use to set the timing on a 1993 Ford F150 4.9l straight six engine.
By default some trucks come with two timing marks. However, only one is correct so the other is wrong. I will quickly show which Timing marks to use.
old trucks how to set the timing inline six motor 90s
![](https://i.ytimg.com/vi/H4TV_kM9TyY/maxresdefault.jpg)