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i just read the dry weight between the 5.2 crate engine and the 7.3 crate engines... theres a 2lbs difference..

(536lbs vs. 538lbs)

now once a supercharger is added to the 7.3 im sure it'll be more than 2lbs heavier.. so i guess that aluminum vs iron block doesn't make much difference now...

and for comparison 3.5 ecoboost weight is coming in at 449lbs...

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