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The 2001 is an overheat cam(SOHC), while your '97 would be a pushrod overhead valve (OHV). Swapping the two would be far more complicated than you would think.
You would probably have to change most of the electronics, a few accessories, redo the exhaust, and probably need new motor mounts and a tuner to re-calibrate the computer, even if you use the ECU from the 2001, you need to calibrate it for your transmission and gear ratios.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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