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5.3 vs. 6.0


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#1 tyhuck

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Posted 06 May 2010 - 08:41 AM

Let me preface by saying that im still in the wishing, researching, and planning stages of my V8 swap. Hopefully some day I can get around to actually getting parts together.

I know that the Vortec 5.7 swap is the easiest route since the engines are the most similar to the 4.3, but those are getting hard to find in my area because the bubbas around here run them until they explode (sometimes literally). So that got me to thinking, which LSX engine would be better suited for my Z? The 5.3 seems like the obvious choice but what about the 6.0? Everyone says theres no replacement for displacement, but every 6.o Ive ever owned drank gas like it was free. Would it still guzzle gas in this small of a truck? Basically heres what Im thinking.

5.3L V8
lighter weight, better fuel mileage, Potential for multi displacement system...................

6.0L V8
More HP, More Tq..........................

Now you guys chime in. I want everyones $.02 on which LS based engine is better and why.
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#2 Zr2x350

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Posted 06 May 2010 - 09:13 AM

Depends on how deep your pockets go man. 6.0 is the only way to go between the two if you know what your doing and know how to do it.
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#3 Big96zr2

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Posted 06 May 2010 - 09:27 AM

you can get some damn good power from 5.3s with a little bit of money...prolly less than you would have in just the 6.0. I am very happy with my 5.3 with the LS6 cam/ milled heads/ EFI Live tune...although, a bigger cam for some snappier throttle response would be nice.
I was able to get my 5.3 for 350 bux with the harness/ecm. just gotta look around and be ready to buy as soon as something pops up, if you wait around you will miss it.

I say go with the 5.3 and throw some good parts at it.

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#4 tyhuck

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Posted 06 May 2010 - 09:52 AM

The main thing Im worried about is fuel mileage. I know either one will be an upgrade over the 4.3L. Im gonna leave them pretty much stock, except for some headers and some other bolt-ons. I will go with the 6.0 if I can keep the fuel mileage around the 20mpg mark, just so I can say its a 6.0. If the 6.0 wont do that, Im gonna go with a fairly stock 5.3. I know the 5.3 in my wife's Tahoe will run like a scalded ape so in an s10, it will be plenty of power for me.
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#5 QuickSilverAWD

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Posted 17 May 2010 - 02:48 AM

I don't see how a 6.0 would get 20mpg to be honest. I have no experience in the matter outside the fact my cousins 6.0 doesn't get more than 18mpg.
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#6 cknaffle

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Posted 17 May 2010 - 05:25 AM

True enough, the 6.0 is a thirsty engine. If you're worried about mileage, the 5.3 or 4.8 is the way to go.

#7 stanzr2

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Posted 17 May 2010 - 04:59 PM

What about 6.2? 430 hp or supercharged 556 hp

stan
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#8 ducksface

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Posted 17 May 2010 - 05:11 PM

QUOTE (stanzr2 @ May 17 2010, 05:59 PM) <{POST_SNAPBACK}>
What about 6.2? 430 hp or supercharged 556 hp

stan



I've looked at the 6.2 556hp, and unless your rpm's are over about 4200 it's not much for the money. Look at the curve in the link. I don't think it's suited to a truck. It probably has a wildl y low 40 to 70 mph time for passing, but if it ain't revved to the moon, it ain't much. So it appears to be for throttle stomping. The non-turbo has a flat torque curve, better suited, and half the price.

Edited by ducksface, 17 May 2010 - 05:13 PM.

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#9 stanzr2

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Posted 17 May 2010 - 05:34 PM

The one i've been eyeing is the l92 i think. Stock cadillac escalade its over 400 horse and can be had for a decent price. But with my current financial situation im just gonna stick with the 4.3 unless i find one for a super deal.

stan
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#10 tyhuck

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Posted 17 May 2010 - 07:49 PM

QUOTE (cknaffle @ May 17 2010, 05:25 AM) <{POST_SNAPBACK}>
True enough, the 6.0 is a thirsty engine. If you're worried about mileage, the 5.3 or 4.8 is the way to go.



Kool. Ill be looking for a 5.3 if I cant find a 5.7 to suite me. Thanks. Feel free to keep up the discussion though.
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#11 01blaZeR2

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Posted 17 May 2010 - 07:52 PM

I think for a z a 5.3 is plenty. I got 17 mpg highway in my silveraqdo w/ 35's on a L33 or L59 i cant remember which one. It had plenty of power esp in a smaller truck like a Z. Chris is def. right the 6.0 is thirsty and im sure you would get better in a z vs a fullsize its still not gonna be that great.
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#12 00-Blazer-Z

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Posted 17 May 2010 - 08:03 PM

If you're really worried about gas milage, then I don't think a v8 swap would be good for you. I mean, the 4.3 puts out a decent amount of power for a street queen.
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#13 MWood

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Posted 17 May 2010 - 08:50 PM

My truck with the 5.7 gets better gas mileage than the 4.3 did. Granted its still not much.
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#14 cknaffle

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Posted 17 May 2010 - 09:03 PM

If your swap is done right and you don't get too carried away with the engine, your mileage should improve after the V8.

#15 tyhuck

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Posted 17 May 2010 - 10:01 PM

Im not really looking to increase my mileage with a V8, I just dont want it to drop. I get 15 on average around here and 20 on the highway. I have heard of several people with V8 S10s that get 18-20. My original concern was wether or not the 6.0 would maintain a similar mileage. With everyone's input I have come to the conclusion that either a 5.7 or a 5.3 will be a good upgrade in power and mileage, which makes sense because the 6.0 is just a 454 in a small block package.

Edited by tyhuck, 18 May 2010 - 07:46 AM.

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#16 MWood

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Posted 18 May 2010 - 10:23 AM

QUOTE (tyhuck @ May 17 2010, 10:01 PM) <{POST_SNAPBACK}>
... the 6.0 is just a 454 in a small block package.


?
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#17 tyhuck

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Posted 18 May 2010 - 11:25 AM

Well I dont mean litterally. The 6.0 is what they replaced the old 454 with. The 5.3 was the replacement for the 350 and the 4.8 replaced the 305. All three of the LS based engine have the same block, just punched out to different displacements. At least thats what Ive always been told since the changes took place.
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#18 cknaffle

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Posted 18 May 2010 - 11:27 AM

No, the replacement for the 7.4 was the 8.1, which was only made for a few years. The only engine choices in a HD truck now are 6.0 or 6.6 diesel.

#19 ducksface

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Posted 18 May 2010 - 12:39 PM

QUOTE (cknaffle @ May 18 2010, 11:27 AM) <{POST_SNAPBACK}>
No, the replacement for the 7.4 was the 8.1, which was only made for a few years. The only engine choices in a HD truck now are 6.0 or 6.6 diesel.



I have an 8.1 in the 2004 3/4 ton Avalanche. The horse power and torque ratinga aren't what you would expect, but it pulls really hard off the line, stays flat till about 5k rpm, and doesn't hunt for a gear going up hill. I get about 13mpg

MY 2003 5.3 avalanche gets 15ish. We use up a vehicle, we couldn't care less about mpg
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#20 tyhuck

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Posted 18 May 2010 - 01:05 PM

QUOTE (cknaffle @ May 18 2010, 11:27 AM) <{POST_SNAPBACK}>
No, the replacement for the 7.4 was the 8.1, which was only made for a few years. The only engine choices in a HD truck now are 6.0 or 6.6 diesel.



I guess thats according to how you look at it. Im not agreeing or disagreeing with you. I was just told the info I stated earlier by a dealership mechanic. Im not saying hes right because hes a mechanic, Im just staing thats where I got my info. He may have been comparing power numbers to make his assumption. The way he explained it, they downsized all their motors and then added the 8.1L. Again, he may have been wrong, and honestly, I dont care one way or the other whos right. This whole post is just to explain my train of thought so I dont look like too much of an idiot. Which, now that I think about it, it may make me look more like an idiot. Oh well, reallycrazy.gif biggrin.gif reallycrazy.gif
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