WEIGHT? 5.4 VS 4.6

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well a 4.6L aluminum block is 70lbs lighter than an iron block. so i'd guess the 5.4L aluminum block would be about 50lbs lighter than the iron 4.6L.

if handling is a concern, remember that the center of gravity is a bit higher in the 5.4L engine. but probably not much to worry about. also, you'll need a new hood with a 5.4L.