This is the noise my 2011 F-150 Ecoboost engine makes on cold starts. A very loud rattling/grinding noise from the timing chain.
As of October 13th 2014 there is a TSB 14-0194
• Ford F150 3.5L Ecoboost Rattle Upon Start ...
There is an on-going thread at F-150Forums here:
http://www.f150forum.com/f70/2011-eco...
If your truck is making this noise you need to take it to the dealer and get them to diagnose it.