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Old 02-05-2013, 09:40 AM   #1
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5.7 or 5.3?

I will be getting the 5.7 V8 today for a future install into my TJ. A friend has a 5.3 in a '99 Z71 truck that runs really good that I could swap with him if you guys tell me it would be better to use. I know the 5.7 is 255 HP with 330 ft lbs torque but do not know what the 5.3 has. I think the 5.3 would be a better match to my 5 speed and the kind of driving I will be using my TJ for.
Your opinions will be greatly appreciated!
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Old 02-05-2013, 09:47 AM   #2
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A 99 5.3 will be about 295hp and about 330lbs of torque. It'll probably do a little better in the way of mileage because of the fuel injection.

Just to make things easy, see if you can get the harness, PCM, tranny, and transfer case, in other words, the complete package. It would be a 4 wire hookup (you'll have to have the harness modded and PCM flashed for your particular application) and you'll have to fab mounts for it, but it would be the easiest way to go.

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Old 02-05-2013, 10:40 AM   #3
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Lindel, the 5.7 is a '99 year model, is fuel injected and has the complete wiring harness and PCM as well.
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Old 02-05-2013, 10:51 AM   #4
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Everything I've researched says the 5.3 is the easier swap, at least from the electrical standpoint.

Converting the TJ / LJ Jeep Wranglers to GM Engines

Not the bottom line on a LS series engine swap, I know, but some decent info there. I was going to do this swap (5.3/4L60E) into a J-10, but life intervened and I ended up selling the engine to another member here.
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Old 02-05-2013, 11:23 AM   #5
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Thanks, Lindel! I was under the assumption that, for some reason, the 5.3 would be the easier swap too. Just didn't know why.
Dubs
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Old 02-05-2013, 12:06 PM   #6
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Quote:
Originally Posted by Dubs99sahara View Post
A friend has a 5.3 in a '99 Z71 truck that runs really good that I could swap with him if you guys tell me it would be better to use. I know the 5.7 is 255 HP with 330 ft lbs torque but do not know what the 5.3 has.
My 2002 Chevy Silverado brochure shows the following specs for the 5.3L V8:

285 HP @ 5200 rpm
325 lb-ft @ 4000 rpm

HTH
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Old 02-05-2013, 12:41 PM   #7
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The Novak literature say the 5.3 is the most popular engine and is best suited for my AX15 transmission. This is the one that I will most likely go with. I know my friend's 5.3 to be in excellent condition and he would like the 5.7 for his Z71 truck. So for a little boot from him I can have an excellent and known engine for my swap.
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Old 02-05-2013, 12:51 PM   #8
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If your talking about gen 3 5.3 and 5.7 then I'd go with 5.7. It's an aluminum block vs iron and more displacement. I'm doing a 5.3 in my TJ for cost, 5.7s cost more. The 5.3 is a lm7 and 5.7 is a ls1 for early gen 3s. They both bolt the same everywhere, so swap is the same.
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Old 02-05-2013, 04:58 PM   #9
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id rather have a 5.3 than a real ls1. in a jeep though I'm not sure it would make much difference other than ease of swap.
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Old 02-05-2013, 05:05 PM   #10
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Originally Posted by 6InARowMakesItGo
id rather have a 5.3 than a real ls1. in a jeep though I'm not sure it would make much difference other than ease of swap.
What part of the swap would be easier, they are the same platform unless its a newer drive by wire 5.7. Other than that its the exact same swap procedures.
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Old 02-05-2013, 05:05 PM   #11
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The 5.3 is a heck of a motor. My moms '03 suburban has 195,000 miles on it and it still pulls like crazy. If I was doing a v8 swap I'd do the 5.3 hands down. The suburban she had before it was a '93 and it had the EFI 5.7 with 230,000 miles but even with 100,000 miles less it didn't have the power and torque that the 5.3 still has
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Old 02-05-2013, 05:10 PM   #12
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Quote:
Originally Posted by B-wils-TJ
The 5.3 is a heck of a motor. My moms '03 suburban has 195,000 miles on it and it still pulls like crazy. If I was doing a v8 swap I'd do the 5.3 hands down. The suburban she had before it was a '93 and it had the EFI 5.7 with 230,000 miles but even with 100,000 miles less it didn't have the power and torque that the 5.3 still has
Completely different motor, a 93 5.7 liter isnt even a vortec motor just yer standard tbi motor, maybe 185 hp at the most. That said, if your gonna do a v8 swap and your main goal is power, theres no substitute for cubic inches!!!
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Old 02-05-2013, 05:19 PM   #13
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Even still, you line up a stock 5.3 and 5.7 (vortec or not) and the 5.3 will win everytime
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Old 02-05-2013, 05:22 PM   #14
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Quote:
Originally Posted by B-wils-TJ
Even still, you line up a stock 5.3 and 5.7 (vortec or not) and the 5.3 will win everytime
Yeah
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Old 02-05-2013, 05:38 PM   #15
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Originally Posted by B-wils-TJ
Even still, you line up a stock 5.3 and 5.7 (vortec or not) and the 5.3 will win everytime
I would disagree, comparing the 93 to 99 that is two different platforms. Say a 99 5.3 to 99 5.7 I'd go with the 5.7. Yes the 5.3 is a good motor, but the 5.7 is lighter (aluminum block) and more power.
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Old 02-05-2013, 05:44 PM   #16
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Quote:
Originally Posted by XDR

I would disagree, comparing the 93 to 99 that is two different platforms. Say a 99 5.3 to 99 5.7 I'd go with the 5.7. Yes the 5.3 is a good motor, but the 5.7 is lighter (aluminum block) and more power.
I just kept my mouf shut, i knew where it was headed.
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Old 02-05-2013, 05:58 PM   #17
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I currently have a 99 silverado with 256k miles on it and it runs just as good as day one..our other company truck was a 97 2500 with a 5.7 and it had 362k on the clock before we sold it..as a matter of fact a guy is still driving it around as we speak..whatever motor you choose you wont be disappointed..
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Old 02-05-2013, 06:16 PM   #18
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Originally Posted by B-wils-TJ View Post
Even still, you line up a stock 5.3 and 5.7 (vortec or not) and the 5.3 will win everytime
You don't know what you're talking about

Quote:
Originally Posted by Dubs99sahara View Post
I will be getting the 5.7 V8 today for a future install into my TJ. A friend has a 5.3 in a '99 Z71 truck that runs really good that I could swap with him if you guys tell me it would be better to use. I know the 5.7 is 255 HP with 330 ft lbs torque but do not know what the 5.3 has. I think the 5.3 would be a better match to my 5 speed and the kind of driving I will be using my TJ for.
Your opinions will be greatly appreciated!
Dubs
Which 350 is it? Even though it's from a 99 GM did make "classic" trucks that used the prior gen body and motor which was the vortec 5.7. If that's the case get the 5.3 but if you're talking about a LS1 i'd take the LS1 any and everyday...if for nothing else you'll get 50 more ponies and a lighter block. But really both engines are amazing and very similar. Some f-body guys put 5.3 heads on their LS1 for the compression/smaller combustion chamber...the 01-02 f-bod LS1's have the 5.3 cam. Just saying they're in the same family.
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Old 02-05-2013, 06:19 PM   #19
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Guess I was wrong.. My bad. I still like the 5.3 though
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Old 02-05-2013, 06:31 PM   #20
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What part of the swap would be easier, they are the same platform unless its a newer drive by wire 5.7. Other than that its the exact same swap procedures.
i'll leave you to the wide world of internet to do your own research. every single article i've read has explained that the 5.3 is easier and for a few different reasons.
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Old 02-05-2013, 06:35 PM   #21
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op you should also think about where in the rpm's you want your power to be. do you want it down low or up high.
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Old 02-05-2013, 06:56 PM   #22
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i'll leave you to the wide world of internet to do your own research. every single article i've read has explained that the 5.3 is easier and for a few different reasons.

ls1 5.7 vs lm7 5.3 swapability..

motor mounts - exact same
throttle body - early ls1 cable, lm7 cable
intake, fuel rail, coils - ls1 car style lm7 truck makes no real difference on swap
flywheel/clutch - can use the same
headers - same

what articles mention it is easier beside cost to do a 5.3 swap? a ls gen 3 series motor is essentially the same swap all around, ls1, lm7, lq4, lq9, ect.. the main difference on the ls1 and such swaps is the 03+ i believe are fly by wire instead of cable driven throttle body.

now speaking of power and where the power comes in is different, yes. the 5.3 is a truck engine and is designed more for torque, where the ls1 is performance oriented motor.

personally if i didn't care for money i'd go for the lq4, 6.0. it is a low compression motor that you can throw boost at it with stock internals, or you can do the lq9, 6.0 that is a high compression motor.
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Old 02-05-2013, 06:58 PM   #23
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Originally Posted by SeVeReDiStOrTiOn

You don't know what you're talking about

Which 350 is it? Even though it's from a 99 GM did make "classic" trucks that used the prior gen body and motor which was the vortec 5.7. If that's the case get the 5.3 but if you're talking about a LS1 i'd take the LS1 any and everyday...if for nothing else you'll get 50 more ponies and a lighter block. But really both engines are amazing and very similar. Some f-body guys put 5.3 heads on their LS1 for the compression/smaller combustion chamber...the 01-02 f-bod LS1's have the 5.3 cam. Just saying they're in the same family.
Lol
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Old 02-05-2013, 07:18 PM   #24
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Originally Posted by XDR View Post
ls1 5.7 vs lm7 5.3 swapability..

motor mounts - exact same
throttle body - early ls1 cable, lm7 cable
intake, fuel rail, coils - ls1 car style lm7 truck makes no real difference on swap
flywheel/clutch - can use the same
headers - same

what articles mention it is easier beside cost to do a 5.3 swap? a ls gen 3 series motor is essentially the same swap all around, ls1, lm7, lq4, lq9, ect.. the main difference on the ls1 and such swaps is the 03+ i believe are fly by wire instead of cable driven throttle body.

now speaking of power and where the power comes in is different, yes. the 5.3 is a truck engine and is designed more for torque, where the ls1 is performance oriented motor.

personally if i didn't care for money i'd go for the lq4, 6.0. it is a low compression motor that you can throw boost at it with stock internals, or you can do the lq9, 6.0 that is a high compression motor.
like i already said. your either holding a cell phone or in front of your computer, which means you are just as close to any number of articles detailing both swaps. look for yourself and stop asking me to provide them please.
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Old 02-05-2013, 09:15 PM   #25
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All the LS series of engines (LS#, LM7 etc) all use the same wiring scheme, meaning they'll all be pretty much the same install, require the same type of flash (with minor differences depending on the donor vehicle) as long as you're talking the Gen III family.

Any of the engines would be a major upgrade for your TJ. As I said before, get all the goodies that you can, engine, harness, PCM, fuse block, transmission and t/c. It'll make for a much smoother swap, with minimal need for adapters.

I can tell you that my '03 Silverado had the 4.8L with 230K+ on the clock when I traded it for my TJ. Only thing on the engine to give up the ghost was the water pump at 100K. It was still managing 21 to 22 mpg on the highway.
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Old 02-05-2013, 09:41 PM   #26
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There seems to be alot of confusion here. Remember in 99 there were 2 completely different 5.7s. One was the standard old cast iron sb with vortec heads and was used in a pickup. The other was an all aluminum LS1 that came in vettes and fbody's. Which one is it?

If its the old school cast iron sb i'd take the 5.3. It has alot of advantages. If its the all aluminum LS1 then i'd take that. That would be physically the same as the 5.3 but more cid and all aluminum.
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Old 02-05-2013, 10:17 PM   #27
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op you should also think about where in the rpm's you want your power to be. do you want it down low or up high.
That's a good point but i'd still take the lighter LS1. I've owned both and the power under the curve is similar between the two, it just feels higher in the rpms with LS1 because the top-end pulls so much harder. Same sorta thing with the LT1 vs LS1 but that's a whole nother can. He can also throw a custom cam in before the swap if he really thinks low-end torque will be an issue.
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Old 02-06-2013, 07:16 AM   #28
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There seems to be alot of confusion here. Remember in 99 there were 2 completely different 5.7s. One was the standard old cast iron sb with vortec heads and was used in a pickup. The other was an all aluminum LS1 that came in vettes and fbody's. Which one is it?

If its the old school cast iron sb i'd take the 5.3. It has alot of advantages. If its the all aluminum LS1 then i'd take that. That would be physically the same as the 5.3 but more cid and all aluminum.

That was my thought exactly!
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Old 02-06-2013, 07:35 AM   #29
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OK, I got the 5.7 Vortec yesterday evening. It is the iron block engine. It came with absolutely everything, starter, A/C comp, ECM with harness including the fuse box, intake. A friend brought me a bellhousing this morning. I need to get a flywheel and clutch components for it. I believe I will keep this engine. I plan to pull the oil pan check the bottom end, replace the rear main as it looks like it might be leaking a little. Might even install a larger capacity oil pan if it will fit into the Jeep and maybe install a new oil pump even though I was told this engine has good oil pressure. Pull the intake and freshen up the seals there and the oring around the distributer shaft. Possibly install a new water pump just because it will be so easy to do right now. Since this will be more or less a road vehicle with trails and unimproved haul roads as 4 x 4 driving I think I will leave the internals alone at this point. By keeping this engine, I will eliminate having to help swap engines with my friend. Less work is good.
I appreciate all the comments concerning the two engines and just might look into a stronger pulling low end cam. I loved the way my V8 S10 5 speed truck pulled at low RPMs. So much smoother and easier pulling out and managing slow driving situations.
I'm looking forward to getting everything together as I prepare for the swap later in the year.
Thanks for so much all the information and help!
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