I was about to purchase a 1999 F250 5.4 triton. I went to research them on the internet and found that there are hundreds of hundreds of people who have had sparkplugs blow out of the head stripping all the threads and breaking the coil. Costing 3500 to 5000 dollars to repair with the same faulty head so to anybody out there looking to get one of these I suggest not. I will stick with my 2003 Chevy Z71 1500 5.3 may not pull as much but at least it stays together.