5.7 vortec vs 5.3l or 6.0 swap

[MrPink]

I get that you hate LS motors, (you've made that abundantly clear across many threads) but I'm calling bullshìt on this. My NBS daily has a bone stock 5.3 and it'll spin the 22's on dry pavement in a straight line.

I can do the same with my Suburban with the 5.3L too.

 

[RedneckWithPaychecks]

I can put 35s on my 89 but for towing, and to reduce rub, I use 33s. I plan on doing either 5.38 or something more when I paint it bass boat metal flake purple and add flames and do a triple turbo supercharged duramax and lift it 15 inches.

I also can tow quite a lot with my 89 K2500, the 454 with whatever trans I have in it (either a TH400 with a Gear Vendors OD or a 4L80E). I make some power, I haven't put it on a dyno, but it makes ~245 Hp and maybe 365 FT/LB Torque. That takes into account age, my K/N cold air, some other mods, the tires, etc.
My TBI 350 in my 94 K1500 is a little harder to guess. For one, it has some hodge-podge'ed side pipes. I think it makes 205 hp with 315 Ft/lb torque; again taking into account age and the mods.
My 5.3 vortec (02 Tahoe Z71) is all stock so taking into account age it makes ~265 hp and maybe 325 lb/torque.

The way those all handle the power is different, but I've towed heavy loads with all of them and I 100% prefer my 89 K2500. My wallet doesn't.

 

[L31MaxExpress]

The 5.3LS and 5.7V are basically equal for peak torque. They just have differently shaped curves.

The 5.7L makes well over 400 ft/lbs when it has headers and a cam like the 395' Marine aka Ramjet/HT383. The 5.3 doesn't get to 380 tq much less 400 until it has a decent cam and it happens way higher in the rpm curve.

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I get that you hate LS motors, (you've made that abundantly clear across many threads) but I'm calling bullshìt on this. My NBS daily has a bone stock 5.3 and it'll spin the 22's on dry pavement in a straight line.

I have the datalogs from the acceleration runs if you want to take a look. No wheelspin, just dog until 30+ mph. That was with torque management eliminated on throttle stab and the timing bumped up on 91 octane.

 

[stutaeng]

...I also like my 5.3 that I swapped (along w/ a 4L80e) into my 99 NBS 1500 ECSB 2wd/3.42... Towing rating 7,000# & payload of about 1400#. It's not a stump puller, but the thing sings after 2,000 RPM. Previous was a 4.3/4L60e that had low oil pressure, so the 5.3 was the natural choice. All for about $3k, doing the work myself.

...My 00 GMT400 K3500 SRW CCLB has a 5.7 Vortec w/ 4.10s. Towing rating 6,500#/payload about 3400#. Obviously, a bit underpowered for such a heavy beast, but the torque is there down low and with gearing, not that bad. It does seem to not make a bunch of power over the 3k mark, unlike the LS-series. They are just different animals as everyone has stated.

...I also like my LQ4 2500 SUV w/4.10s. Towing rating 9600#/payload about 2500#. Pretty peppy for such a heavy vehicle. I would say out of the three, this is my favorite.

All trucks with stock engines, 4L80e and LT265/75/16... I personally think for a lighter truck like a 1500, the 5.3 is perfect. Heck, they even came in some of the early GMT800 2500 (non-HD.) Just throw some 3.73/4.10+ for towing/large tires.

There, I have an engine for each of the ones listed on the thread title! OP Question: What engine, 5.3, 5.7 or 6.0? Me: Well, All of them, of course! I'm joking!

Budget is something to think about when considering building an engine, and hasn't even been touched! $500 or $5,000? A set of pistons, rods, and such are expensive, as are machining costs. Then you gotta pay someone to build it that knows what they are doing and those guys ain't cheap. Doesn't sound like OP is an engine builder. Aftermarket heads....get your checkbook out or you better have a good stash of money under your mattress. An LS swap (6.0 for OP) adds extra complications because they are not a direct swap, so there's that. But many folks don't even open them up, just drop them in. I don't know what a 383 crate engine is going for today (maybe around $5K?), but perhaps that's an option for you. That should be a direct swap.

Reliability? I'll take the LS for the distributerless/COP ignition and injector setup. It seems more reliable and easier to diagnose to me. Distributors are wear items, and unfortunately, it doesn't seem like they are making many quality replacement parts these days. Probably only going to get worse in the future. I could care less what dyno numbers or charts are. Those videos are really cool to watch, until you got start pricing stuff. I'm using my trucks to commute and haul junk, not racing.

 

[0xDEADBEEF]

The 5.7L makes well over 400 ft/lbs when it has headers and a cam like the 395' Marine aka Ramjet/HT383. The 5.3 doesn't get to 380 tq much less 400 until it has a decent cam and it happens way higher in the rpm curve.

When frogs have wings they don't bump their ass on the ground.

 

[618 Syndicate]

The 5.7L makes well over 400 ft/lbs when it has headers and a cam like the 395' Marine aka Ramjet/HT383. The 5.3 doesn't get to 380 tq much less 400 until it has a decent cam and it happens way higher in the rpm curve.

That's literally what he just said...

I have the datalogs from the acceleration runs if you want to take a look. No wheelspin, just dog until 30+ mph. That was with torque management eliminated on throttle stab and the timing bumped up on 91 octane.

No, that's not necessary. It won't change my opinion of what you claim.

 

[letitsnow]

We all have our opinions. I have had 9 trucks with 5.3's, and feel that they are an excellent car motor.

 

[Drunkcanuk]

We all have our opinions. I have had 9 trucks with 5.3's, and feel that they are an excellent car motor.

Subtle!!!!! Lol

 

[618 Syndicate]

We all have our opinions. I have had 9 trucks with 5.3's, and feel that they are an excellent car motor.

Took you that long to figure out you didn't like em?

 

[letitsnow]

Took you that long to figure out you didn't like em?

Ha - not really. I still like them. But for something that needs to do work, I prefer a 5.7 +.