Yep..it's a 5.4 thing. I think they redesigned the heads on the 5.4 somewhere around 07 to help with that prob. I actually think the breakage prob affects all the 3V engines in the 04-06 range, this includes the v10 also.
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 2008 f150 supercrew, 5.4, 3.73 LSD, tonneau cover, 275-65-18 BFG's. Gryphon programmer. XLT with XTR package. Tinted heads and tails with 8000 HID's. 4300 in the fogs. Gott's Mod. Painted grill.
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