5.3 4l80e, first time swapping

**87stepside** · 08-27-2021

Thanks for adding me, I am brand new to tuning vehicles myself. Looking forward to learning so that I can get my project on the road. Stock 5.3 with a 4l80e for now.

5.3 (4.8 pistons and Howard's rattler cam future)
4l80e
Stock 2.73 open rear (3.42 lsd future).

**In-Tech** · 08-27-2021

what's up with the 4.8 pistons? 4.10 rear gear is what you want with that overdrive and any kind of cam :)

**trlrider** · 08-28-2021

Originally Posted by In-Tech

what's up with the 4.8 pistons? 4.10 rear gear is what you want with that overdrive and any kind of cam :)

4.8 pistons are the same as the 5.3 (L33/h.o.) engines and are flat-top, which I believe creates like a 10.2:1 or 10.3:1 compression ratio, all other things being the same IIRC.
Now I have something to study and did not feel like studying tonight. LOL!

**87stepside** · 08-28-2021

Originally Posted by trlrider

4.8 pistons are the same as the 5.3 (L33/h.o.) engines and are flat-top, which I believe creates like a 10.2:1 or 10.3:1 compression ratio, all other things being the same IIRC.
Now I have something to study and did not feel like studying tonight. LOL!

Only difference in the 4.8 and 5.3 is the stroke, they have the same bore. I may put the pistons in without a cam and see if someone has a bin for the h.o. 5.3

**trlrider** · 08-28-2021

What pcm are you using for your project.
If it is ,05 or later you may be stuck using HPTuners to tune. P01's and P59's have much more open source support.

**LeMarky Dissod** · 08-28-2021

Slightly off-topic:
L33s came with 'LS6ish heads' without the LS6 valvetrain yeah - the 799 casting?
706-casting heads would be a cheap upgrade.

https://www.cpgnation.com/lets-talk-...ruck-upgrades/

If you already have better heads, disregard.

Originally Posted by trlrider

What pcm are you using for your project?
If it is '05 or later you may be stuck using HPTuners to tune. P01's and P59's have much more open source support.

LM7, L59, LM4, & L33 all used P59.

**87stepside** · 09-02-2021

Originally Posted by trlrider

What pcm are you using for your project.
If it is ,05 or later you may be stuck using HPTuners to tune. P01's and P59's have much more open source support.

i have a 4896 p01 im planning to use, however its 9373372 OS so i'm pretty sure i need to swap OS to 12212156 or whatever is best. someone on the pcm hammer facebook said i need checksum plugins? idk what that means so any input or advice is great.