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LS Engine Swap in 03 ZR2


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#1 03Zr2V8

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Posted 20 October 2011 - 05:50 PM

Just completed a 4.8 swap into my s-10 and thought I'd share...

Since I am a broke ass just finishing university I opted for the more budget-friendly approach.

As I decided to build or modify the wiring harness that came with the engine instead of buying a prefabed one. Don't think it was that difficult.

The stock truck accessories did fit but once I slapped the LS2 intake on it, it was next to impossible to route an air intake.

Modifications so far include:
LS2 intake
complete stainless header back exhaust (shorties)
Transmission reprogramming kit
performaced tuned ecm

I am planning to supercharge, does anyone have an info or experinence on how much torque can be put to a 4L60e??
Also curious, once i ripped the engine out I noticed the lower control arm mounts to the frame were cracked. Has anyone ever encountered this?



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#2 98s10zr202

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Posted 20 October 2011 - 06:14 PM

nice work, welcome to the site, bring up some videos when u finish

how much did this all run u if i may ask

#3 rennat_2006

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Posted 20 October 2011 - 06:23 PM

What mounts did you use?
Move the motor forward or back from stock?
How are you cooling it?
etc...

#4 N2O_ZR2

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Posted 20 October 2011 - 06:57 PM

The 4L60 wont take too much over stock, but with just a 4.8 you wont make much. Increasing the line pressure may help, but if you can't afford to build it than I'd leave it alone.

And the frame cracks are pretty common it seems.



#5 03Zr2V8

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Posted 20 October 2011 - 07:53 PM

QUOTE (98s10zr202 @ Oct 20 2011, 07:14 PM) <{POST_SNAPBACK}>
nice work, welcome to the site, bring up some videos when u finish

how much did this all run u if i may ask


well its all finished now. blows stock 5.3 silverados out of the water

Well I haven't really tallied it all up yet.
$600 for the engine, harness and computer
$300 for the intake and fuel rails
$600 for all of the stainless fittings (then i had to fit and weld ot together)
$1500 in misc fittings, filters, hoses, tubing and other parts
$500 for the ecu tuning software

thats mostly the big stuff but i fabbed most of the parts myself whiched saved some money
probably around $4000 all said and done. Canadian prices by the way not llike it makes a difference

#6 N2O_ZR2

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Posted 20 October 2011 - 08:04 PM

That was an expensive 60hp and 25tq.

I guess at least it's ready for a 6.0.

#7 03Zr2V8

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Posted 20 October 2011 - 08:10 PM

QUOTE (rennat_2006 @ Oct 20 2011, 07:23 PM) <{POST_SNAPBACK}>
What mounts did you use?
Move the motor forward or back from stock?
How are you cooling it?
etc...


I used modified stock mounts and wherever the stock bell housing of the tranny mounted to the engine is where i mounted. More or less it was in the stock position. I didn't need to incorporate a body lift or anything.

Also for the a/c compresser. I had this engine mocked up in a blazer first and found that the front sections of the frame for ZR2s are actually lower than regular s-series. this meant that the engine sits higher relative to the frame but the same relative to the body. Because of this the oil pan didn't have to be notched out as much and the frame only had to be dimpled instead of heavily notched seen elsewhere. This is my experience anyway.

Most builds i have came across switch out the truck accessory bracket for an F-body or corvette which allows for much more room in between the accessories and the rad. I stuck with truck accessories which doesn't leave much room and I can't fit extremely high flow fans. Right now i am using the stock rad with two puller fans and not overheating. In the summer with A/c i definitely will over heat. As you may know the stock rads are single core, single pass which is shit. To solve this problem I intend to take two stock rads and weld them together and fab some aluminum tanks and make a duel core 2 pass rad and not have any loss in space between the rad and accessories.

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#8 rennat_2006

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Posted 20 October 2011 - 08:10 PM

Wow seems expensive seeing how i just finished putting a 5.3l into my little brothers 79 Chevy k10 for like half that price including the engine and we kept it all factory fuel injected.

#9 03Zr2V8

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Posted 20 October 2011 - 08:19 PM

QUOTE (N2O_ZR2 @ Oct 20 2011, 09:04 PM) <{POST_SNAPBACK}>
That was an expensive 60hp and 25tq.

I guess at least it's ready for a 6.0.



well right now I have roughly calculated it to be around 300hp and 290tq with the high flow exhaust, intake and performace tune. but yes expensive. more or less to see if i could do it. but at the time it was the only engine available and the 6.0L were running over $1200. and the fuel economy was another factor. 6.0L would be outragious but i get better economy with the 4.8 than i ever did with the 4.3. I did just buy a complete 6.0L 2 weeks ago for a steal and was considering dropping that in but decided that a supercharger would be cooler which is why I was wondering about the tranmission. They say they can take up to 400ft.tq. which is what i plan to put to it. May have to invest in building one

#10 N2O_ZR2

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Posted 20 October 2011 - 08:22 PM

Those mounts are probably going to separate, they do that with just a stock 4.3.

#11 03Zr2V8

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Posted 20 October 2011 - 08:24 PM

QUOTE (rennat_2006 @ Oct 20 2011, 09:10 PM) <{POST_SNAPBACK}>
Wow seems expensive seeing how i just finished putting a 5.3l into my little brothers 79 Chevy k10 for like half that price including the engine and we kept it all factory fuel injected.


everthing is much more expensive in Canada... i could have cut the costs in half if i forwent the intake, tuning software and fancy exhaust.

#12 chad19

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Posted 20 October 2011 - 08:33 PM

ill take that 6.0 off your hands and do a 408 stroker out of it.

#13 N2O_ZR2

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Posted 20 October 2011 - 08:44 PM

QUOTE (03Zr2V8 @ Oct 20 2011, 09:19 PM) <{POST_SNAPBACK}>
QUOTE (N2O_ZR2 @ Oct 20 2011, 09:04 PM) <{POST_SNAPBACK}>
That was an expensive 60hp and 25tq.

I guess at least it's ready for a 6.0.



well right now I have roughly calculated it to be around 300hp and 290tq with the high flow exhaust, intake and performace tune. but yes expensive. more or less to see if i could do it. but at the time it was the only engine available and the 6.0L were running over $1200. and the fuel economy was another factor. 6.0L would be outragious but i get better economy with the 4.8 than i ever did with the 4.3. I did just buy a complete 6.0L 2 weeks ago for a steal and was considering dropping that in but decided that a supercharger would be cooler which is why I was wondering about the tranmission. They say they can take up to 400ft.tq. which is what i plan to put to it. May have to invest in building one

Drop in the 6.0 then supercharge it. If you are going for more power you're better off with more displacement.

#14 jwwaldschmidt

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Posted 20 October 2011 - 10:33 PM

Congrats on completing the swap. I would definitely find a different setup for motor mounts though, I have a feeling you're going to run into issues using "modified stock".

Good work.

#15 BLACK96regcabHighrider

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Posted 21 October 2011 - 07:56 AM

Nicely done. We need some videos now!

x2 about the motor mounts. Stock are really soft rubber and lots of people have problems with them holding a 4.3.


CONGRATS AND WELCOME

#16 03Zr2V8

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Posted 21 October 2011 - 12:08 PM

So the modified stock mounts are shit. Any suggestions??

#17 N2O_ZR2

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Posted 21 October 2011 - 12:12 PM

QUOTE (03Zr2V8 @ Oct 21 2011, 01:08 PM) <{POST_SNAPBACK}>
So the modified stock mounts are shit. Any suggestions??


JW got some nice looking mounts for his swap, I don't think he fab'd them in yet though.

#18 jwwaldschmidt

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Posted 21 October 2011 - 12:15 PM

I got mounts that are designed to fit a regular 4x4 S-10, which uses different motor mounts than our Zr2's. I will be doing some custom fabbing to make them work though.

There's absolutely nothing out there for our trucks, as far as LSx Swap mounts. You're going to have to do some fab work. Take a look at my swap thread, I've listed the mounts I used - it's in my sig, the "Heart Transplant".

#19 rennat_2006

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Posted 21 October 2011 - 01:32 PM

Or get some energy suspension poly mounts and modify them like you did the stockers, in your case that is what id do.

#20 jwwaldschmidt

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Posted 21 October 2011 - 01:33 PM

QUOTE (rennat_2006 @ Oct 21 2011, 01:32 PM) <{POST_SNAPBACK}>
Or get some energy suspension poly mounts and modify them like you did the stockers, in your case that is what id do.


Still wouldn't last near as long as the interlocking style I posted.

If you're able to modify it, do so.




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