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i would prepare myself for possible vct/valvetrain/timing chain issues with higher mileage engines, esp if routine oil changes weren't adhered to. it wouldn't deter me from making a purchase, but modular variable valve timing systems do seem to be a weak spot.

i only own a 5.4 3-valve in a f-150, but everything i have read (and experienced) point to that. best of luck with your purchase!
 
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