Hey guys just wanted to get some educated info/opinions on a motor build for my vehicle. I currently have a lifted sierra 1500 ext cab short bed with
5.3 stock engine
4l60e trans
4.56 front and rear diffs
37" tires
I believe the GVWR is around 6000

Looking for some info on a decent build that i can achieve around 450hp fuel injected with around $6k. Should i stroke the 5.3? use ls2? ls3? internals?

I have experience with top end components, but where i get fuzzy is the bottom end internals as i haven't spent a whole lot of time there so any theories, know how, or detailed info would be very appreciated.

The reason I'm doing this is because I have quite a few miles on the engine as its a 5.3 and its been pushing 37's and 20 inch wheels for quite a while now, still goes A to B fine but its getting tired and i would like to put together my own engine with some more guts.

thanks guys!

 

if it were me and it was once, I went with a 6.0/4L80.

I did all mine for just under 5,500. Its night and day. well worth the swap

https://www.performancetrucks.net/fo...s-list-513912/

 

I did the 5.3/60 thing for a couple years and recently went 6L/80E and wish I would have done that from the start.
heavy trucks need the cubes and heavy trucks are hard on transmissions so start with a solid plateform and go from there.
I have spent a lot of money on setups over the years so just trying to help

 

sounds good. did you guys get an 80e out of a junkyard and rebuilt it? im finding remanned ones from GM cores on the web for around 2.7k-3k claiming to be built for 4x4, 750hp and whatnot. texas speed also has a 370cid block with the rotating assembly in it, which is probably more to my benefit for 3.4k i believe.

 

I just bought a stock rebuilt 80E with a shift kit from a local shop with 2 year warrenty.
as I start to break parts in it I will upgrade

 

im just wondering what it would take to do a 6l80e instead of 4l80e if you feel lucky. other then that i would look at a good 6l 4l80e swap with a nice converter and cam.