Originally Posted by keaton5.0
Well, the 5.4 is physically larger than the 5.8 if you are talking about the 5.8 windsor. As for weight im not sure but if i had to guess id bet the 5.4 is also heavier. And a rebuilt 5.8 is just as new as the day you rebuilt it.
My buddy was refering to the technology that's in it, (ie. Better mpg and more power comparrd to the mpg.)