The 10h Digit is a 4 & the 8th is L. It is a F250 super duty don't know if that maters but the majority of "5" (3 valve P.O.S round II 5.4) motors I've seen were in F150's of that year model.

I think in the 2004 F250 it was either the "L" 5.4 2V, "S" 6.8 V-1... Login to read more.