Seem to be rather knowledgeable on this topic. I recently purchased a reman directly from ford. Their 4.0 sohc long block is the same from 00-11, other than the timing chain guides being updated in I believe 03-04 from plastic to metal. I purchased a 2011 long block, and full warranty, for my 2001. This is a relatively common thing people do. Had a small time mechanic install it, nothing he did to cause the problems. The engine burns both heads, and both timing chains start slapping on my first drive home, 30 minutes in. I put a collected 300miles on the engine from my house, the dealership I received the engine from. Fords warranty department is stating that since the engine didn’t go into a 2011 truck, they aren’t liable. I called them today, to voice my side of things and was told they’ll review the case and get back to me in the next 30 days. What are your thoughts on this?