I was just doing some think ing today and was considering swapping in an LS1 when my 5.3 dies. I would consider something like the 6.0 but I would really like to keep my 4L60E and figured I could get just as much power that the 60 would handle with a little better gas mileage than the 6.0. I know I could get the power out of the 5.3 but I'd like some change.

I'm not sure if its possible to bore/stroke a 5.3 to 5.7, if so I would consider that as well if the LS1 doesn't have huge advantages over that options.

Just wanted to get some people's opinions on the subject.