By the way... As for Ford changing the Head design on the newer F150 5.4L engines, there is no proven data and when looking at the heads side-by-side you can not see any differences between them. They were supposed to make the port for the Plug ground Probe larger to hinder the carbon-binding that siezes the probes in the heads. Even if you read the Ford TSB and follow it to the "T", step by step they do not come out easily. Even after soaking the plugs, in head, for 2 days with Aerokroil as per the TSB. Ford did not even release a new part number for the heads between 2004 and 2009 for the 5.4L.