Originally Posted by 46Tbird
The tech at Ford said improper engine assembly caused it. Lands and rings were broken in multiple places. And this was cylinder 8, at 23700 miles, on a completely stock car. 
It does seem to run better than ever down low now, lol. It's smoother for sure. But I haven't had it over 3.5k yet so I don't know if it's any stronger. Maybe I'll dyno it again after 1000 miles.
All I can say is I suggest an Aluminator Budget for anyone that is modifying a Coyote.
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Wow. Was it covered by warranty?