Quick Question: 4.8 Swap
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Quick Question: 4.8 Swap I have a 2008 Express van with the 4.3 V6. I want to swap in a 4.8 motor. Keeping it cheap. 😂
I have 2 options, the LY2 or newer L20. I'm going to buy a complete motor with accessories, wiring harness and ECM.
If I go with the newer motor, L20, will the L20 engine harness plug into my vehicle harness. I'd assume the older LY2 would.
I will be disabling VATS and tuning with HP Tuner. Just want it to be mostly plug and play!
I have 2 options, the LY2 or newer L20. I'm going to buy a complete motor with accessories, wiring harness and ECM.
If I go with the newer motor, L20, will the L20 engine harness plug into my vehicle harness. I'd assume the older LY2 would.
I will be disabling VATS and tuning with HP Tuner. Just want it to be mostly plug and play!
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Joined: Sep 2016
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From: North Jersey
I had a 06' 3/4 ton express with a 4l80e and now have a 14' with the 6 speed auto.
Both had/have the 4.8
My .02
just get another 4.3 and be done with it.
The 4.8 doesn't (to me) have that much more power then the v6 to justify the swap.
If you are set on doing it, go the 5.3.
Apples and oranges.
I have an 04' Suburban which probably weighs more then my van and it will smoke it.
Put the air on with the 4.8 and forget about it.
Both had/have the 4.8
My .02
just get another 4.3 and be done with it.
The 4.8 doesn't (to me) have that much more power then the v6 to justify the swap.
If you are set on doing it, go the 5.3.
Apples and oranges.
I have an 04' Suburban which probably weighs more then my van and it will smoke it.
Put the air on with the 4.8 and forget about it.
Thread Starter
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Joined: Feb 2017
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I had a 06' 3/4 ton express with a 4l80e and now have a 14' with the 6 speed auto.
Both had/have the 4.8
My .02
just get another 4.3 and be done with it.
The 4.8 doesn't (to me) have that much more power then the v6 to justify the swap.
If you are set on doing it, go the 5.3.
Apples and oranges.
I have an 04' Suburban which probably weighs more then my van and it will smoke it.
Put the air on with the 4.8 and forget about it.
Both had/have the 4.8
My .02
just get another 4.3 and be done with it.
The 4.8 doesn't (to me) have that much more power then the v6 to justify the swap.
If you are set on doing it, go the 5.3.
Apples and oranges.
I have an 04' Suburban which probably weighs more then my van and it will smoke it.
Put the air on with the 4.8 and forget about it.
I just need to find out if the newer 4.8 harness will still be plug and play with my 08 vehicle harness. Thanks for your input though!
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From: North Jersey
I hope I didn't come across wrong. That wasn't my intent.
When the 06' got totaled my shop gave me an old 1/2 ton with the 4.3 in it and noticed it wasn't that much different in power.
My 14' gets about 12.8 during the winter months according to the on board computer.
I don't recall what the 4.3 got.
I don't drive 55 tho! LOL!
When the 06' got totaled my shop gave me an old 1/2 ton with the 4.3 in it and noticed it wasn't that much different in power.
My 14' gets about 12.8 during the winter months according to the on board computer.
I don't recall what the 4.3 got.
I don't drive 55 tho! LOL!
Thread Starter
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Definitely not, just telling you why I was choosing the 4.8 over 5.3. Hard to believe the 4.8 is still a dog over the 4.3 that makes much less hp. I've never driven a 4.8 so I don't know first hand.
That sucks to hear about fuel mileage. I get 13 in my 4.3, I don't go 55 either. 😂 Best ever was 16 mpg.
That sucks to hear about fuel mileage. I get 13 in my 4.3, I don't go 55 either. 😂 Best ever was 16 mpg.
Teching In
Joined: Oct 2017
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I had a 06' 3/4 ton express with a 4l80e and now have a 14' with the 6 speed auto.
Both had/have the 4.8
My .02
just get another 4.3 and be done with it.
The 4.8 doesn't (to me) have that much more power then the v6 to justify the swap.
If you are set on doing it, go the 5.3.
Apples and oranges.
I have an 04' Suburban which probably weighs more then my van and it will smoke it.
Put the air on with the 4.8 and forget about it.
Both had/have the 4.8
My .02
just get another 4.3 and be done with it.
The 4.8 doesn't (to me) have that much more power then the v6 to justify the swap.
If you are set on doing it, go the 5.3.
Apples and oranges.
I have an 04' Suburban which probably weighs more then my van and it will smoke it.
Put the air on with the 4.8 and forget about it.
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Restricted User
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Likes: 109
From: Ohio
He also never said anything about the differences in 4.8 and 5.3 bore and stroke.
I'd say you're more wrong than he is.
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Verdad Gallardo TECH Enthusiast
Joined: Sep 2016
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From: North Jersey
The replacement van (16') was a 4.8 also with a 6sp and 3.42's.
It was worse then with the 80E.
It's a slug. In my van with (3.73's) NOT a car with 0 mods.
With a turbo on it in a car, it would probably haul as it should being force fed.
The 5.3 is a 323 NOT a 327
Unless you like to round up.
Thanks Joe,
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From: North Jersey
Ok,
GM must have REALLY screwed up putting the 450 hp LT1 in my wifes 16' M6 SS camaro when the just could have put a better cam in a 4.8 and tune in it!
I still don't get you equating a 4.8 to a 327 and 5.3 to 5.7 but whatever makes you happy.
GM must have REALLY screwed up putting the 450 hp LT1 in my wifes 16' M6 SS camaro when the just could have put a better cam in a 4.8 and tune in it!
I still don't get you equating a 4.8 to a 327 and 5.3 to 5.7 but whatever makes you happy.
Restricted User
Joined: Mar 2014
Posts: 7,192
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From: Ohio
4.8:
3.78" Bore
3.267 Stroke
Area of Bore
3.78 / 2 = 1.89
1.89 * 1.89 = 3.57
3.57 * 3.14 = 11.21
Displacement of Cylinder
11.21 x 3.267 = 36.64
Displacement of engine = 36.64 x 8 = 293.15 cubic inches.
A 327 and a 350 are old small block engines, not gen 3 small blocks.
An LS1 is 5.7L and 346 cubic inches.
Go away.
3.78" Bore
3.267 Stroke
Area of Bore
3.78 / 2 = 1.89
1.89 * 1.89 = 3.57
3.57 * 3.14 = 11.21
Displacement of Cylinder
11.21 x 3.267 = 36.64
Displacement of engine = 36.64 x 8 = 293.15 cubic inches.
A 327 and a 350 are old small block engines, not gen 3 small blocks.
An LS1 is 5.7L and 346 cubic inches.
Go away.
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Just in case you're stuck in the past and still don't understand:
https://summitracing.custhelp.com/ap...6-stroke-chart
https://summitracing.custhelp.com/ap...6-stroke-chart
TECH Enthusiast
Joined: Sep 2016
Posts: 518
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From: North Jersey
I edited my post.
Sorry to the OP for getting off topic.
Last edited by wht/73; Oct 25, 2017 at 06:22 AM.