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The 5.4L is classified as an interference engine, which means valves will come in contact with pistons if the engine is rotated at any time timing gears and sprockets are not aligned. Having said that, if that happened while the engine was running, there is a strong probability that internal engine damage has already occurred.
On the other hand, if internal damage was not found, I could upload the procedure for you.
Please see attached PDF for instructions.