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If you buy a used engine, keep the original core and have it rebuilt as time allows. Then you will have an engine ready to go in the future. This will ensure that the used engine will never break and last forever. 
The cost difference will depend upon how much wear there is on the original motor. At 220K miles I would anticipate the crank and block to require machining to bring everything back to factory tolerances. That would like mean griding the crank journals, boring the cylinders requiring over-sized pistons/rings and oversized crank bearings to match. I would also expect the heads would need fairly extensive work (guides, all new valves, valve seats and springs). The cams and cam followers etc will need to be carefully checked for wear too. That covers the motor...then you will need to check the turbos. You may need to have the bearings and seals replaced.I am somewhat mechanically inclined but have a black thumb when It comes to cars.![]()
Oh...I just read your original post I noted you had the turbos replaced. Hopefully you can reuse them with the refreshed or new motor.The cost difference will depend upon how much wear there is on the original motor. At 220K miles I would anticipate the crank and block to require machining to bring everything back to factory tolerances. That would like mean griding the crank journals, boring the cylinders requiring over-sized pistons/rings and oversized crank bearings to match. I would also expect the heads would need fairly extensive work (guides, all new valves, valve seats and springs). The cams and cam followers etc will need to be carefully checked for wear too. That covers the motor...then you will need to check the turbos. You may need to have the bearings and seals replaced.
Whatever your decision is I wish the best of luck.
Mike
Good list. The idea of coordinating all of that precise inspection, machining and dis/reassembly work, and paying for all of it, always feels pretty daunting to me. And I work daily in a engine dynamometer test lab where we do exactly this kind of work, every day. We're pretty darn good at it, since we have to be... but it's still pretty easy to get just one aspect or component slightly wrong, and scrap the motor or at least have to do it all over again.The cost difference will depend upon how much wear there is on the original motor. At 220K miles I would anticipate the crank and block to require machining to bring everything back to factory tolerances. That would like mean griding the crank journals, boring the cylinders requiring over-sized pistons/rings and oversized crank bearings to match. I would also expect the heads would need fairly extensive work (guides, all new valves, valve seats and springs). The cams and cam followers etc will need to be carefully checked for wear too. That covers the motor...
As an aside - we need to pool resources and start buying used EB engines for resale. 💲💲I get that putting in a used, high-mileage motor would be a big gamble also. But that's why my thought was to look for a t-boned f150 with under 100k miles. There's literally dozens near me available.
F150ecoboost engine supplier.As an aside - we need to pool resources and start buying used EB engines for resale. 💲💲