I am going to build another 1000hp twin turbo setup using an LS platform. I told myself if I did it again I was going to do it for mileage also...

So... what year and model would you start with, should it use AFM, VVT, DOD, etc? (It has to be a newer aluminum block version, not iron)

I am going to be using a 6l80e 6 speed trans so it must be ECM compatable to work with the T43 TCM in the trans...

What do you think?? If you had a choice to start with a certain year, or model 5.3, which one would you choose and why?

 

Why a 5.3? Thats a lot of power to try and squeeze from a "small" engine, which means its not going to last very long or be very street friendly.

 

Well, the 5.7 I used had no problems making that power for a long time, so I am not to worried about the 5.3. I want mileage...

 

I we talking 1000hp to the wheels or engine hp? Pump gas?

 

A 1000hp 5.3 isn't going to getting any better gas mileage than a 1000hp 5.7 or a 1000hp 6.0

 

Only 800 at the wheels. Definetly pumpgas...

I am hoping to find out from the 5.3 guys in the know, what 5.3 engine is the best platform to start with for this task of mileage and power...

 

A 5.3 gets more mileage then a 5.7, 6.0, 6.2. I can always make the power I need with boost, but I cant get better mileage unless I start with a small motor. 5.3 will be a great foundation...

 

pm Mitch (sprayeddenali) he has a twin setup on his 5.3 and makes about that

 

i really dont understand how anyone can say the 5.3 wont last long with 1000 horse... as long as you are smart about your boost and have everything properly setup IE alky, timing and total tune, nicely built bottom end, and keep your oil changed regularly... it should last just as long as a 5.7, 6.0, 6.2 blah blah blah... hell even a 4.8... they are all the same type of block design...

 

How much mpg do you want making 1000 hp. I haven't taken a highway trip with my 3.23 gears but I did get 16mpg highway on 3.42s and 408.