I had a similar issue and sound on my replacement engine--right after it was put in--inmy case--the ticking was most noticeable only on first start/cold--so I had to keep the car overnight with them for them to diagnose-- the ford dealer then also told me it was lifters sticking--people here at the time seemed to disagree since they are solid as felix mentioned. Possibly a valve guide?
In any case--the dealer at the time put in some sort of additive to prevent valve/lifter sticking. I was sceptical that it would work--but it cured the problem--and 50K miles on--no issues or recurrence yet...
D23 Crew #29