04' silver. 4.8 swap for 5.3

[BIG ORANGE]

I'm not totally satisfied w my 4.8 in power and towing my bike trailor w going to the beach, thought of having a 5.3 put in. What all would be involved in this swap? Would it be as easy as when we used to swap out the old 305 for a beefy 350????
Just wondering before I try this myself!
Thanks......

[Clyde65]

would be just like that, except you would need to reprogram your PCM, piece of cake.

[usmcchevy]

You can go 5.3 or 6.0 with just a tune. Or PM member Shon and try a custom computer tune with your 4.8, I think you'll be surprised.

[BIG ORANGE]

Originally Posted by usmcchevy

You can go 5.3 or 6.0 with just a tune. Or PM member Shon and try a custom computer tune with your 4.8, I think you'll be surprised.

The bore and stroke is different on a 4.8 and a 5.3 isnt it? I would think so!

[Pop's C-10]

cam & tune tha 4.8....

[clinebarger]

5.3L & 4.8L share the same bore, The 4.8 has a shorter stroke. The factory tune in your PCM will run a 5.3L NO problem.

[BIG ORANGE]

Originally Posted by clinebarger

5.3L & 4.8L share the same bore, The 4.8 has a shorter stroke. The factory tune in your PCM will run a 5.3L NO problem.

usmcchevy guy says that I can tune my 4.8 to run like a 5.3 atleast that's what I gathered from his reply above. So if that the truth then why change motor's? What kind of program needs to be added or what??? I'm clueless to this pcm crap!!!

[primetime]

i'm not sure that is what he implied... i think he is saying you can swap out the 4.8, and then put in the 5.3 without having to change the computer.

[clinebarger]

Originally Posted by BIG ORANGE

usmcchevy guy says that I can tune my 4.8 to run like a 5.3 atleast that's what I gathered from his reply above. So if that the truth then why change motor's? What kind of program needs to be added or what??? I'm clueless to this pcm crap!!!

I was just pointing out a stock 5.3L will run just as good with the stock 4.8L tune as it does with a stock 5.3L tune in the PCM. I have swaped several 4.8s for 5.3s for towing purposes & the 5.3 always outperfomes the 4.8

[usmcchevy]

Originally Posted by BIG ORANGE

usmcchevy guy says that I can tune my 4.8 to run like a 5.3 atleast that's what I gathered from his reply above. So if that the truth then why change motor's? What kind of program needs to be added or what??? I'm clueless to this pcm crap!!!

I never said run like a 5.3, just that a custom computer tune may be enough to give you the power you are looking for.

Give this place a call for more info on the computer tune, he is a vendor here.

https://www.herronperformance.com/st...&productId=260

[BIG ORANGE]

Originally Posted by usmcchevy

I never said run like a 5.3, just that a custom computer tune may be enough to give you the power you are looking for.

Give this place a call for more info on the computer tune, he is a vendor here.

https://www.herronperformance.com/st...&productId=260

Thanks for clearing that up for me, now I just need to decide which way would be my best route to follow!

[biggsteve97]

Originally Posted by BIG ORANGE

The bore and stroke is different on a 4.8 and a 5.3 isnt it? I would think so!

The 5.3L is nothing more than a stroked 4.8L. I have a 4.8 in my 02 1500 4x4 with a few bolt ons and it will keep up with the slightly modified 5.3 in my Tahoe. Swap in a LQ9 6.0L cam and a good tune and you would net roughly 330hp or more with the 4.8. its cheaper than a swap and tune. there is a guy on ebay selling genuine gm LQ9 camshafts for $69.