i am not validating nor discrediting the statement about et improvement..

only to clearify...internal weight is very different than external weight..
especially the closer you get to the crank shaft.
if the intermal/recipricating parts of a 727 are
70 lbs lighter..then that would be substantial..
dont confuse this with haveing a bag of sakrete in your bed..
its two....totally different issues..

as far as if it decreased a second..?
i have no direct experince..so i wont comment.
cheapst