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Message: [QUOTE="kleake, post: 1493482, member: 25987"] Yep, as has been said, this happens to stock or tuned. In my case, it has been tuned most of it's life, I picked it up at 175k. Towed heavy fairly often, had head gaskets start to leak under heavy throttle around 210k. Babied it to 225k, rebuilt the top end and that's when my bigger problems started. (New from Ford: Heads, injectors, rockers, lifters, HPFP, front cover, etc.) Turns out there was a change in rockers that I (and Ford) wasn't aware of and caused valves to hit the pistons lightly. Also the head gaskets didn't hold, so I pulled it apart again around 235k. Ford warrantied out the heads and rockers. Put it all back together and it's been perfect until this, which appears to be a faulty injector from Ford. Funny how the OEM injectors lasted 225k, but the new ones lasted 25k. All of my EGR and emissions stuff is and has been gone for quite some time, and that is why I think I was able to make it this long without a major issue. I've heard of several with less than 100k with more problems than I have had. Tuning can stress things like head gaskets if you haven't studded it, but other than that as long as tuning isn't extreme or it's driven crazy hard, it should be fine. [/QUOTE]

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