< Ford tech. The modular motors are certainly interference engines. I knew that already but I just searched the workshop manual trying to find proof because some people want that and all I found was this warning : CAUTION: Unless otherwise instructed, do not rotate either the crankshaft or the camshafts when the timing chains are removed and the cylinder heads are installed. Severe piston and valve damage will occur. Which is stated several times in the timing section of the shop manual for the 4.6 and 5.4.
Edit: I also looked and couldn't find anywhere you are "otherwise instructed" either haha, I'm not sure why they put that in there.