Not Ranked
While I agree that a reputable engine builder may take more care in building a high performance engine, I am not sure that I agree with the liability wiggle room.
Ford is a big company and spends lots of money on R&D and Testing because they do not want to be liable. I think this is why ford tests their components in Durability tests, running their crate motors in a test cell for 50 hours at full load and RPM. Then tears down the engine and has their engine specialists look at each component for wear and fatigue. Then they run another unit until catastrophic failure and tear it down and do a root cause failure analysis on the engine. At that point either the engine meets its intended usage or they go back to the drawing board. Not sure how many engine builders out there have the financial ability to do this.
Ford may shop around for best prices for piece parts but I doubt they just swap in part changes at will without delta testing to prove the engine still meets requirements.
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