Originally Posted by 1Gary
Yes I know this is early on looking into this.It does have me wondering if Chevy by design built these not to gave much output early on and that is the reason for the good gas mileage.
you have that entirely backwards. They have GREAT low end out put and that goes along with good gas mileage. I don't know how you could think they have poor low end.
Compare the 5.3l to one of the original 327's.