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how hard is it to swap a navi 5.4 4v into my 2002 fx4 5.4. what is the problems in this how much power incress with the 4v motor.
It isn't a difficult swap-there will be some small exhaust modifications needed,and a bit of wiring to mate the engine to harness properly. The 4V 5.4L makes 45 more hp and 5 more ft-lbs over it's 2V 5.4L counterpart.
JL
will it still work with the factory computer in my truck
You'll need to have it retuned to be optimal-the 4V engine has much more spark advance than the 2V. You can use the variable intake runner control circuit from the 5.4L to control the IMRC on the 4V-that will need to be adjusted in the PCM programming too.
JL
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