Can I put a 2002 4.2 explorer engine
into my f150. 1999 it currently has a
4.0 in it.
The problem is there is a large amount of work required when you replace a different size engine in a vehicle. Motor mounts, exhaust system, transmission, emissions, gauges, wiring, etc. All of this needs to be figured out. If you are paying a garage to figure all this out, it will be a very expensive endeavor.