Vortec 5.7 vs LS 6.0 swap - S-10 Forum
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post #1 of 32 Old 02-25-2019, 05:21 PM Thread Starter
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Vortec 5.7 vs LS 6.0 swap

So I picked up a 01 Blazer X to do a V8 swap. Had my heart set on a 6.0 as my last 4 vehicles were lq9 or l92’s. Really wanting it to be a weekend or one week max swap as this is my dd. I know the 5.7 is basically bolt up with some mounts and headers and some 02/injector rewiring. The ls swap is pretty intense electrical wise and I’m not forking over close to a grand for plug and play. So if I go for 5.7 with a lt4 hot cam how much am I missing out on. I do have springs and cam for the 6.0. 220/224 .600 lift on 111 lsa.

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post #2 of 32 Old 02-25-2019, 07:11 PM
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Re: Vortec 5.7 vs LS 6.0 swap

I haven't done a LS swap. Lots of SBC's, tho. Getting everything done in a week is possible if you really stick to it with a 5.7 and everything goes right.
What I've seen of the LS swaps on here leads me to believe that for it to be ready to drive daily, in a week is highly optimistic. Most seem to be long term projects and most folks seem to realize that at the onset. Not saying it can't be done.

I think in both cases mounts and headers is the quick part. Exhaust, cooling, wiring, are the time gobblers. More so on the LS because front drive,
radiator, and electrical are much different than the 4.3. You go sticking a cam in the LS and you'll also have tuning to deal with. The fact your Blazer has been lower by a PO isn't going to make things easier.
I'd buy a $500 beater to drive while you do the swap and then sell it for $500 when you're ready to trust the swap as a DD. Most swapped S-10's don't see daily service. They're garage queens meant to be an ongoing project. Note I said most, not all.

As far as what you'll leave on the table with a 5.7 vs 6.0? You'd notice the difference in the middle rpm range. But if you are doing one or the other, you'll never get to actually compare them. With either you will notice the torque improvement over the 4.3's mild 260 lb-ft. and since the 5.7's torque comes on at lower rpms it will feel like more in traffic. On freeway on ramps the 6.0 would scream.
The Vortec 5.7 generated 255 horsepower at 4,600 rpm and 330 foot-pounds of torque at 2,800 rpm
LQ4 6.0 generated 300 horsepower at 4400 RPM and 360 lb-ft at 4000 RPM
LQ9 was rated at 345 hp at 5200 RPM and 380 lb-ft of torque at 4000 RPM.
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post #3 of 32 Old 02-25-2019, 07:29 PM Thread Starter
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Not gonna lie I was full blow ls 6.0 and found one local complete with harness and computer lq4 for $700... but after looking at how involved it will be compared to the 5.7 I don’t think it’s an option. If it was a garage queen show truck or race truck then def but it’s not. I can get a 5.7 under 100k with trans for $850 local. Plan to run a new 4.3 stall converter and should be 2300-2500 behind the 5.7. I’ll do a 224/230 cam and I have a set of comp ls springs that will work on the Vortec heads. I’m not gonna be out street racing it. I’ll do a sonnax kit on the 4l60 with upgraded servos. It should be plenty fun to drive. Get a new 4.3 radiator and recess it in the core support and grab some intrepid fans. The 8.5 should hold up until I get an 8.8 with 4.10’s. I just need to look at who can tune the computer for the cam. I’ll prob give black bear a call and see what they can do for it.
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post #4 of 32 Old 02-25-2019, 08:57 PM
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Re: Vortec 5.7 vs LS 6.0 swap

I don't think swapping to a 8.8 is necessary on a vortec 5.7. Though are you sure you have an 8.5"? they only came in 5 spd W engine code (L35) trucks. If it is an 8.5" I'd stick with that and just change the gears in it to whatever ratio you want.
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post #5 of 32 Old 02-25-2019, 09:45 PM
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Re: Vortec 5.7 vs LS 6.0 swap

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I don't think swapping to a 8.8 is necessary on a vortec 5.7. Though are you sure you have an 8.5"? they only came in 5 spd W engine code (L35) trucks. If it is an 8.5" I'd stick with that and just change the gears in it to whatever ratio you want.
I Concur!!!
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post #6 of 32 Old 02-26-2019, 06:05 AM Thread Starter
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I think you are correct. I checked last night and it appears to be a 7.5 with 4.10 gears going off the GT5 in the glovebox. I’ll check at sourcing a 8.5 with 3.73-4.10 gears with a locker.
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post #7 of 32 Old 02-26-2019, 06:10 AM Thread Starter
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Looks like a 7.5 🤷‍♂️
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post #8 of 32 Old 02-26-2019, 10:34 AM
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Re: Vortec 5.7 vs LS 6.0 swap

[QUOTE=Carp0331;12176245]Looks like a 7.5 🤷‍♂️[/QUOTE]

What is all of this junk in red??

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post #9 of 32 Old 02-26-2019, 11:52 AM
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Re: Vortec 5.7 vs LS 6.0 swap

[quote=Rhotpursuit;12176279]
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Originally Posted by Carp0331 View Post
Looks like a 7.5 🤷‍♂️[/QUOTE]

What is all of this junk in red??
Government mind control.
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post #10 of 32 Old 02-26-2019, 12:12 PM
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Re: Vortec 5.7 vs LS 6.0 swap

Echoing what oldeerslayer said... the hangups in the swap tend to be the finishing items, not so much the mounts and headers. Everyone always worries about those but they cause the least issues.

You've done your homework pretty well. For your DD use, given your time constraint, budget limitation, and goals, I don't think you're really missing out on anything. Both the 6.0 and 5.7 will guzzle more gas than the 4.3 for sure, which is a DD concern of sorts. But relative between them the gas guzzling won't be that much different. At moderate RPM's the efficiency of LS vs L31 isn't all that different, both being computer controlled electronic fuel injected systems.

The LS has more power potential on the cheap, largely because LS heads are superior in many ways to most any SBC head, but in relatively stock trim for DD use the 5.7 is more than adequate.

Your existing 7.625" 10 bolt will hold up fine if you want to save cash and time. Especially if you put 4.10's in it. Numerically higher gears, while thinner, experience less torque shock than numerically lower gears.

If you go 8.8" the explorer is 5" wider overall (59.5" WMS), and typically came in 3.73. The 8.8 did not come with 4.10's from the factory. Aftermarket 4.11's are available. (4.10's aren't numerically possible with an 8.8 anyway...)

Not sure why you'd want to use 4.10/4.11 in a DD with a 4L60. First gear becomes stupidly short and pointless. Your highway cruise RPM will be fairly high as well over 65mph... I recommend 3.73's, not only do the 8.8's come that way stock, its about as much gear as you'll want on the street.

I run a 6.2L w/ built 4L60E, 2400 stall TC, 3.73 8.8". I am considering going to 3.55's this year to lower the highway cruise RPM a bit and stretch 1st out a hair more.
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post #11 of 32 Old 02-26-2019, 01:12 PM Thread Starter
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Ready my code in the glove box I have an open diff with 4.10’s. I don’t plan on doing crazy launches but I may add a locker or g80 unit. Before I install I’m gonna do cam/lifters/springs and timing chain. I may pull the heads and hand port them. I’m between a lt4 hot cam and a 268xfi.
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post #12 of 32 Old 02-26-2019, 03:54 PM Thread Starter
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Since I have an 01 which should be the 300mm shaft and updated 4l60e should I use it over the 97 4l60e. Does my 01 have fewer clutches than the 97 or did the update make them both equal?
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post #13 of 32 Old 02-26-2019, 04:22 PM
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Re: Vortec 5.7 vs LS 6.0 swap

Sorry I missed the GT5 rpo code post.

You have an 01' Blazer with a 4.3 & GT5 rear? Interesting.

Anyway, if you're used to the 4.10's and like them with the 4L60E by all means stay with'em, especially since its what you got.
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post #14 of 32 Old 02-26-2019, 04:33 PM Thread Starter
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I was pretty shocked myself. It just feels so gutless with the 4.3 and no doubt it’s prob tired. If I can do the 350 and double my hp i’ll be more than happy.
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post #15 of 32 Old 02-26-2019, 05:55 PM
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Re: Vortec 5.7 vs LS 6.0 swap

My 4.3 had over 200k on it, original, even at the end it was still a good motor. I had 3.08's in the rear. The 4.10's probably contribute to the gutless feeling since the 4.3 isn't a particularly fast revving engine esp. under light throttle. They make the gears excessively short. Most of the factory 4.10's were 4 cyl's, partly to help address the lack of grunt to turn the wheels...

I've complained a lot over the years about how terrible the 4cyl's in these trucks are, but generally not one to complain about the 4.3. Kept well maintained and tuned they were good V6's for their day & tech.

The 350 will definitely move it quicker though!
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post #16 of 32 Old 02-26-2019, 07:35 PM Thread Starter
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I guess I shouldn’t complain but my last 3 vehicles were tunned and cam’d 6.0’s and a 6.2. I got use to the power delivery of the ls engines.
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post #17 of 32 Old 02-27-2019, 12:25 AM
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Re: Vortec 5.7 vs LS 6.0 swap

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So I picked up a 01 Blazer X to do a V8 swap.
I think you've got something strange going on here.

The part of the VIN I can see on the picture is for an 04 extended cab pickup with an NV1500 which only came behind 2.2's.
Can you post another pic of the complete SPID sticker. It's possible a PO swapped glove box doors, in which case you don't have 4.10 rear gears. Never heard of that behind a 4.3. Fuel mileage would be horrible.
Blazers don't have a 122.9 wheelbase.

Check the vin on the sticker against the one on the title or in the corner of the windshield.

Oh, if you plan on swapping cams and porting the heads during the swap, forget your timeline. LOL
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post #18 of 32 Old 02-27-2019, 12:29 AM
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Re: Vortec 5.7 vs LS 6.0 swap

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You have an 01' Blazer with a 4.3 & GT5 rear? Interesting.
I'm also pretty surprised to hear about a 4.3 coming with 4.10s stock. I don't believe it was an option for any 4.3 configuration, even the 4wd. And to make it even weirder, I think something is wacky with that vin number on your glove box sticker, is this a Canadian blazer? 10 digits from the right should be the engine code. The only engine code for 2001 blazer xtreme is W, in fact the only codes for 2001 s-series are W (4.3) and 5 (2.2), your vin is showing H.

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post #19 of 32 Old 02-27-2019, 06:45 AM
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Re: Vortec 5.7 vs LS 6.0 swap

GU6 was the only option for Xtremes:

Chevy Blazer 1995 & GMC Envoy 1999
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post #20 of 32 Old 02-27-2019, 08:19 AM
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Re: Vortec 5.7 vs LS 6.0 swap

That sticker is definitely from a 2003 S-10 ext cab pickup with a 2.2 liter 5 speed.
H - 8th digit - 2.2 liter 4 cylinder gas only - not flex
3 - 10th digit - 2003
MW2 - 5 speed manual - NV1500 96 or newer 2.2l S-10's
122.9 wheel base - ext cab pickup. Not a CC because they weren't available with a 4 or stick.
Where I had typed 04 above for the year was a typo, sorry. Meant 03
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post #21 of 32 Old 02-27-2019, 09:12 AM Thread Starter
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Ahhh well that is weird so I messaged the guy I bought it from and his glove box got damaged so he replaced it with one from a salvage yard... woulda been nice if he swapped stickers. Pretty sure I prob have 3.42’s then
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post #22 of 32 Old 02-27-2019, 10:04 AM
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Re: Vortec 5.7 vs LS 6.0 swap

That makes way more sense!
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post #23 of 32 Old 02-27-2019, 10:34 AM Thread Starter
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And yet I still want 4.10’s haha... biggest issue I’m running into is trying to decide on what type of injection to run. I would love to find a marine intake but no luck. I heard the Vortec intake and injectors restrict it from making any real power. The engine will be torn down to short block so I can home port the heads and do a valve job along with cam and lifters. I just don’t want to do all that then be restricted by the intake. The dyno’s I’ve seen of the Vortec’s have been disappointing. Maybe coming from a 6.0 with decent cam and ls6 heads in a full size putting 375 down... when I see a 350 with a cam hit 230 at the wheels I start to wonder if I should just do the extra work and do the 6.0 swap or will the intake and injector change give me what I want.
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post #24 of 32 Old 02-27-2019, 12:01 PM
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Re: Vortec 5.7 vs LS 6.0 swap

What a cam, injectors, and intake swap will give you on a DD is a PITA. Figure $800 to $1K for a good dyno tune.
I'm a firm believer in keeping the engine stock for a DD. If you want a race truck, build a race truck. No heat or a/c gut the interior and go wild on the engine. Have it tuned for WOT only. Since 1898 folks have been trying to build one car that can do everything. I haven't seen it yet. There will always be something faster, better handling, smoother, quieter, better on gas, etc. But not all the above.
IIRC those marine manifolds are cast iron and heavy.
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post #25 of 32 Old 02-27-2019, 01:07 PM
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Re: Vortec 5.7 vs LS 6.0 swap

Sounds like you're getting lost in the weeds like everyone else does.
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post #26 of 32 Old 02-27-2019, 02:12 PM Thread Starter
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Really don’t want to swap the motor just to keep it completely stock. With my springs I can run a comp 268xfi on 1.6 rockers. Be right around .600 lift. If I keep the stock manifold I’ll go with the mpi spiders and possibly the vmax spacer. But that’s $700 for the two. For that price I can throw on an edelbrock pro flow intake. Some 42lb injectors with rails and 90mm throttle body. That should make power to my 6200 redline easy. Then build up the 4l60 to handle it. I rebuild a 4l65 over the summer. Upgraded sun shield, band, clutches, and sonnax kit/servos. I think it would be a perfect daily. Not too crazy
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post #27 of 32 Old 02-27-2019, 02:17 PM
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Re: Vortec 5.7 vs LS 6.0 swap

[quote=98Sonosls;12176287]
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Government mind control.

Good thing I have some tinfoil...

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post #28 of 32 Old 02-27-2019, 04:56 PM
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Re: Vortec 5.7 vs LS 6.0 swap

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Good thing I have some tinfoil...
Did you miss me while I was away? lol.
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post #29 of 32 Old 02-27-2019, 06:26 PM
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Re: Vortec 5.7 vs LS 6.0 swap

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Did you miss me while I was away? lol.
Wondered where you went...vacation...or jail...lol

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post #30 of 32 Old 02-28-2019, 10:39 AM
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Re: Vortec 5.7 vs LS 6.0 swap

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Wondered where you went...vacation...or jail...lol
Lol. A few weeks in Thailand and a week in San Francisco. Thailand is so chocked full of small & mid size trucks. New style Ford Rangers, Tacomas, Izuzu's, Nissans. I saw one Tundra utility vehicle the whole time I was there, no other big trucks. They have quite a scene for modding trucks as well, lowered, rims, paint jobs, sound systems etc. They are really into the mini trucking stuff and I am sure they'd appreciate what we do here. No S10's though, I assume GM never sold them in or near that market.
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post #31 of 32 Old 03-07-2019, 08:53 AM
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Hey Carp, I will be removing my L31 and T56 soon. Motor is 30 over, mild cam, 1.6 roller rockers and headers. T56 rebuilt by FLT. All low miles. If you or anyone is interested. Let me know.
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post #32 of 32 Old 03-27-2019, 05:01 PM
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Re: Vortec 5.7 vs LS 6.0 swap

I'm getting ready to pull my 5.7 Vortec and sell it. Comes with almost everything needed for a direct swap.


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