We Make 457 HP With a Budget 6.0-Liter LS Engine (2023)

Iron Maiden, Part 2: pulling big power from the stock LS parts bin.

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Jeff SmithWriter

When we left our intrepid Iron Maiden in Part 1, we'd shaken the all-stock parts tree to make enough power to get your attention. No one expects an old iron-head 6.0-liter to make 430 horsepower with nearly the same amount of torque. Imagine how much work you'd have to do to a 355ci small-block Chevy to make that number—it would difficult without porting the stock heads and adding a big cam. And we're just getting the limbered up.

To review, we ended Part 1 with a mild Maiden makeover using a stock LS6 camshaft, an equally stock LS6 intake and throttle body, and shorty headers. That doesn't sound like much, but it paid off with 430 hp and 435 lb-ft of torque.

In this update, we'll push a little harder to see how much power we can make while emphasizing usable torque and horsepower rather than chasing peak numbers. For those in the know, the LQ4 is the pedestrian version of the 6.0-liter truck family with only 9.5:1 static compression. It's also common knowledge that compression adds power everywhere, so we thought that a set of production aluminum heads with a smaller chamber would help.

Frankly, this could have been a much more rewarding step if we'd not screwed up. In the Iron Maiden shop, we have an ever-growing pile of LS parts, so, of course, we grabbed the wrong set of heads when packing to go to Westech. What we had planned to test was a set of stock 4.8-liter/5.3-liter heads (casting numbers 706, 852, or 895) that offer a tiny 61cc chamber. Our Compression Lessons chart illustrates how the compression would change with various heads. Unfortunately, we mistakenly installed a set of stock LS1 853 castings. These heads helped the power slightly, but not like we would have seen with a set of much tighter-chambered 4.8-liter/5.3-liter heads.

Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5.3-liter heads on a 6.0-liter. Our 5.7-liter head test bumped the average power by 9 hp but lost a small amount of torque in the process. This is really budget stuff we're doing, since 4.8-liter/5.3-liter heads are very easy to access. The 4.8-liter/5.3-liter results make sense since an increase of one full point in compression is worth roughly four-percent more power, and at 430 hp a four-percent gain is 17 hp. On the Power Curve chart, see Test 2, which peaked at 433 lb-ft of torque and 432 hp.


Intake and Throttle Body Testing

The next plan was to evaluate how much that vaunted Trailblazer SS intake was worth over the LQ4 truck manifold. We've read some of Holdener's testing on this intake and we were impressed enough to see the results for ourselves. The book on the Trailblazer SS intake is that it makes more torque than the LQ4 intake and more horsepower than the low-profile LS6 unit.

The best part of this plan is that you can buy this new ACDelco intake from RockAuto for a mere $140. Granted, it's a bare manifold, so we configured it with our stock 8.1-liter 30-lb/hr injectors and a very affordable Holley aluminum LS1 fuel rail assembly. This will require a separate aftermarket fuel pressure regulator. This intake also needs a four-bolt throttle body. The only one available at the time of our test was the FAST 102mm version that we borrowed. Some may claim this larger version offers a slight power advantage, but at 430 hp, any advantage would be minimal. As an alternative, you could adapt a three-bolt throttle body using an adapter made by ICT Billet that uses a 75mm through-hole. We've included a part number in our parts list.

The Trailblazer SS intake lived up to its hype, offering a major bump in the torque curve with an average torque gain across the entire rpm spread of 7 lb-ft over the truck intake, along with an 11-hp horsepower increase at peak. The downside is that this intake is just as tall and slightly wider than the LQ4 version, and it's hardly a thing of beauty. But if this manifold will fit under your hood, it is a star player in the power-per-dollar game.

Next, we wanted to see how the LS6 intake would fare with this combination. This is a popular intake because it will fit under any hoodline. We tested the LS6 intake with a stock 78mm throttle body, and as you can see, the combination did lose some low-speed torque compared to both truck manifolds but picked up the horsepower against the LQ4 intake so that the averages were very close. However, the Trailblazer SS intake was better than both the LQ4 truck and LS6 intakes.

Big Bang-for-Buck Cylinder Head Upgrades

Previously, we mentioned how adding the 5.3-liter heads would bump the compression and power. We decided to take that one step further. In earlier stories, we had great luck with a set of 5.3-liter heads that were treated to CNC porting by Richard Reyman and his crew at West Coast Racing Cylinder Heads (WCRCH). The package starts by increasing the intake valve size from 1.89 to 2.00-inches, and also involves some CNC pocket-porting, which improves the flow slightly. But the real gains are on the exhaust side. The accompanying flow graphs reveal how much the intake and exhaust ports improve with his help. We also had WCRCH mill the already small chambers to 58cc, which bumped the compression up to 10.8:1. Combined with the fact that LS engines don't need a lot of ignition timing anyway, this compression is still conservative enough to run on 91-octane fuel.

As you can see from Test 5 in the Power Chart and graph, the addition of these WCRCH-ported heads was worth some serious power across nearly the entire curve, and especially above 4,000 rpm. We averaged the torque gain from 4,000 to 6,200 and came up with an average increase of 20 lb-ft. Bumping the torque that much across a 2,000-rpm band is an outstanding way to help street performance. We can guarantee you will instantly feel that in the seat of your pants.

Peak number improvements were just as good with the WCRCH ported 5.3-liter heads. Peak torque jumped from 435 to 455 lb-ft and from 431 to 457 horsepower, a solid push of 26 hp. Often, gains like these in peak power come at a loss of low-speed torque and drivability, but not here. These little heads that everyone else ignores also bumped the torque even at the lowest rpm we tested. Win-win might be a cliche, but it applies when you really do win everywhere.

The Parts Other People Discard

Remember that this final test is based on our 150,000-mile short block, LS6 intake and equally stock LS6 camshaft. These are parts that other people discard yet we're now making 457 hp. This also means we've left a bunch more power on the table. The sharp ones among you are already banging on your keyboards—"Shove a cam in it, bolt that Trailblazer intake back on it, and spin it up!"

We've already done that, but like any good Hollywood serial scriptwriters, we intend to leave you in suspense. We can tease you a little with a hint that we're going to stick in that bigger-but-still-mild cam, a set of long-tube headers, and that Trailblazer SS intake, and bump the average torque by over 40 lb-ft with similar numbers for average horsepower. If that doesn't get your attention, you might want to check your pulse. Stay tuned, it's about to really get fun!

Swapping heads also meant adding new Fel-Pro MLS head gaskets clamped with ARP head studs to ensure optimal cylinder pressure sealing. We could have used head bolts, but the studs are easier on the threads in the block. The dished pistons reveal that this is an LQ4 truck engine

When we swapped in the aluminum heads, we also added a set of Comp 0.080-inch wall thickness pushrods along with a set of upgraded stock rockers with Comp's high-performance trunnions. Both are really intended as durability improvements


Washer Tech

We ran into an issue that deserves attention when bolting on the heads. When torquing the head studs, it felt like something was giving way, like a bolt was stripped yet it wasn't. It seems that it's very easy for either a head bolt or stud washer to turn as opposed to remaining stationary under the bolt head. If the washer begins to turn as torque is applied, this essentially converts the washer into a bearing. Here's the issue: Almost 50 percent of the torque applied to any bolt is used to overcome the friction between the underside of the bolt and the washer. If the washer spins, it reduces this friction and that additional torque is applied to the fastener. This is usually more than enough additional torque to either permanently elongate the bolt or pull threads out of the block.

The problem stems from the really smooth surface of the head bolt spot face on Coyote, LS, Ford EcoBoost, and even Chrysler Hemi engines. The combination of this smooth machining and the ARP washer can cause the washer to spin under load. This is especially prevalent when there is lube between the washer and the head.

The fix is easy: ARP recommends sanding the head side of the washer with 60-grit sandpaper for three or four strokes. This will help the washer grip the head. We tried it, and it worked very well. We were able to torque right up to the recommended 70 ft-lbs with no problem.

Compression Lessons

HeadSizeRatio for LQ4
LQ4 6.0L71cc9.5:1
LS1 5.7L67cc9.8:1
LM7 5.3L61cc10.4:1
WCRCH 5.3L58cc10.8:1

Flow Test: Stock vs. Ported Intake

Flow Test: Stock vs. Ported Exhaust

Stock Iron 6.0-Liter vs. WCRCH Ported 5.3-Liter Heads

Valve Lift6.0L 2.00" IntakePorted 5.3L Int. 2.00"6.0L 1.55" Exh. Ported 5.3L Exh.

These flow numbers are from WCRCH and were generated on a 3.78-inch bore. On a larger 4.00-inch-bore engine, the flow numbers will improve slightly, especially at higher valve lifts.

  • 1.89 / 1.55 Valve sizes for stock 5.3 heads
  • 2.00 / 1.55 Valve sizes for stock LS1 and 6.0L LQ4 heads
(Video) Minor Upgrades Create Crazy Power on a Junkyard 5.3L Vortec - Engine Power S7, E10

Power Chart

  • Test 1: Best Power Baseline from Part I (LS6 cam test)
  • Test 2: Added 5.7-liter LS1 aluminum heads w/truck intake, shorty headers, LS6 cam
  • Test 3: Added Trailblazer SS intake manifold w/102mm throttle body
  • Test 4: Added LS6 intake manifold w/90mm throttle body
  • Test 5: Added CNC ported 5.3-liter heads, retained LS6 intake and cam
Avg. 403.6325.7402.4334.9409.3341.4402334.8417.5348.7
  • Note: The baseline test used here as Test 1 is Test 3 from Part 1, used because it offered the best power numbers. The Test 4 results from Part 1 suffered from bent pushrods.

Parts List: Budget 6.0-Liter LS Engine

Used LQ4 iron 6.0LN.A. Swap meet$550.00
Holley HP ECU558-500Summit Racing$1,120.95
Holley EFI harness for LS 24x/1x558-102Summit Racing$382.96
Holley harness for LS truck injectors558-214Summit Racing$153.95
Sniper fuel rail LS1850005Summit Racing$114.95
Summit shorty LS headersSUM-9021Summit Racing$199.97
Stock LS6 camshaftUsedFriend$50.00
AC Delco Trailblazer SS intake manifold12580420RockAuto$137.79
ICT Billet 4-to-3-bolt throttle body adapter551511Summit Racing$20.69
AC Delco LS6 intake, used w/TB88894339eBay Motors$400.00
Comp LS rocker trunnion upgrade kit13702-KITSummit Racing$141.97
Comp stock length Hi-Tech pushrods7955-16Summit Racing$131.97
Comp beehive valvespring kit26918CS-KITSummit Racing$339.97
Fel-Pro head gasket, MLS - Left26472L-053Summit Racing$74.97
Fel-Pro head gasket, MLS - Right26472R-053Summit Racing$78.97
ARP head stud kit234-4110Summit Racing$359.16
West Coast Racing 5.3L head CNC5.3L Stage 2WCRCH$1,062.00
Hooker long-tube, 1 3/4-inch dia. headers2289HKRSummit Racing$597.95
Holley Sniper LS1 fuel rail assembly850005Summit Racing$114.95

Watch! The Ultimate Bolt-In Chevy LS3 Engine Swap

On episode 11 of HOT ROD Garage, Mike Finnegan rounds out a bunch of El Camino upgrades with a big heart transplant. Gone is our old 383ci small-block and in its place is a Chevrolet Performance LS376/525 all-aluminum, fuel-injected crate engine that is probably underrated at 525 hp and 475 lb-ft of torque. Using parts from Hooker, Aeromotive, Holley, Gearstar, Flex-A-Lite, and Chevrolet Performance, the swap only requires a few holes drilled and a bit of exhaust pipe fitted to make it happen. In the end, our 1969 El Camino lost some weight and reset the track record on our autocross course. Sign up for a free trial of MotorTrend+ and start watching every episode of HOT ROD Garage today!

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How much HP can a built 6.0 LS handle? ›

This 6.0L LS is designed to handle up to 1,000 hp. It is an upgraded version of our 645 hp naturally aspirated LS. Both engines use seasoned GM 6.0L blocks that we have re-machined on our CNCs to far tighter than the original GM tolerances.

How much HP does a 6.0 LS engine make? ›

Goodwrench service replacement long-blocks are also still available, and there are also lots of cores in the wrecking yard: The 345-hp, 6.0L LQ9 was installed in selected '02-'06 Cadillac SUVs and '04-and-later Chevy Silverado SS pickups. Look for a 6.0L block with the No.

How much HP can a stock 6.0 block handle? ›

In fact, the 6.0L's block, rotating assembly and cylinder heads can support roughly 700rwhp in stock form. No sir, this Navistar-built V8's biggest horsepower handicap is its lack of head-to-block fasteners, as well as the type of fasteners they are.

How much HP can you get out of a LQ4? ›

Upgrading the LQ4/LQ9 Camshaft and Valvetrain
Intake Duration (@ 0.050 in.)Horsepower at the wheels after bolt-onsIdle Quality
197° (Stock)250-270 whpSmooth
215°+50 hpSlightly noticeable
220° - 230°+75 hpSteady lope
230° - 240°+100 hpLopey
Feb 13, 2018

Can you turbo a stock 6.0 LS? ›

Yes, you can make big power by throwing boost at a stock LS engine, however, if you want the horsepower party to last for a long time you'll need to make some changes to the engine. The stock components just can't deal with the stress that forced induction can put on them when you really start to crank up the boost.

How much can a stock 6.0 handle? ›

Even a decade ago, before PCM tuning was anywhere near as refined as it is now, several 6.0L owners proved the 6.0L's bottom end could withstand 700-rwhp. Today, a lot of serious enthusiasts conclude that the 800 hp 6.0 Power Stroke range gets you into unchartered waters with a 6.0L.

What is a LS 6.0 engine called? ›

The 6.0 liter V8 LS2 engine was produced by General Motors for use in performance vehicles and sports cars. It is part of GM's Gen IV Small Block engine family and was first introduced in the 2005 Chevrolet Corvette C6, Chevrolet SSR and the Pontiac GTO.

How do I know what 6.0 LS I have? ›

What LS Engine Do I Have? To figure out what LS engine you're staring at, just consult the RPO code. The easiest way to do this is to find the VIN and reference the 8th digit.

How much horsepower does a stock GM 6.0 have? ›

The last Chevy 6.0-liter engine

Design choices with this V8 engine included either a lighter aluminum construction or a more traditional cast iron block. Both engines capably produced around 341 horsepower, and anywhere between 360 and 380 pound-feet of torque.

What is the highest horsepower small block? ›

The 327 L84 remained the most powerful Chevrolet small block production engine ever until the quad-cam LT5 came out in the 1990s. And it was the most powerful naturally-aspirated single-cam small block until the arrival of the LS6 engine in the early 2000s. It was an engine ahead of its time.

Is a 6.0 a big block or small block? ›

The 6.0L Chevy engine is part of the General Motors LS-based small-block family that's been running strong since 1995. Also known as the Generation IV 6000, these V8 engines are known for their ability to pack a lot of power into a relatively small package.

How much HP can a stock LS block handle? ›

The stock crankshaft can handle about 900 hp and 7,000 rpm (for a limited time). A Forged Crankshaft upgrade will add strength to the bottom end. Stroker cranks will also add extra displacement. If rods and pistons are replaced, it makes sense to upgrade the crank at the same time.

Should I get an LQ4 or LQ9? ›

The ONLY difference between an LQ4 and LQ9 is the piston!

The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. The LQ9 is a limited production engine and VERY desirable as it is the HO 6.0L and comes with a premium price.

How much HP does a 6.0 LQ4 make? ›

300-330 hp

Is LQ4 same as LS? ›

The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000.

Will a turbo 400 bolt up to a LS motor? ›

If your old Chevy came equipped with a two-speed Powerglide, TH350, or TH400, you can bolt the more modern LS up to these factory transmissions. However, one bolt in the bellhousing will not be used on the LS.

Can you supercharge a 6.0 Vortec? ›

The Vortech supercharging system for the 2002-2003 GM Full Size Truck and SUV with the GM VORTEC 6.0L engine will impress you with the obvious attention to detail and fully integrated appearance. Increase your engine's horsepower from 300 to 415 and torque from 360 lb./ft. to 447 lb./ft.

How can I get more power out of my 6.0 LS? ›

The 5 Top upgrades to increase power on the Chevy 6.0 Vortec are:
  1. Tuning.
  2. Long-Tube Headers & Exhaust.
  3. Cold Air Intake.
  4. Upgraded camshafts.
  5. Superchargers.

What is stock bore on 6.0 LS? ›

LS Engine Bore & Stroke Chart
Engine SizeBoreStroke
5.7L (346 c.i.d.)3.898 in.3.622 in.
6.0L (364 c.i.d.)4.000 in.3.622 in.
6.2L (376 c.i.d.)4.065 in.3.622 in.
7.0L (427 c.i.d.)4.125 in.4.000 in.
2 more rows
Jan 5, 2018

What is the stock stroke for 6.0 LS? ›

The 6.0- and 6.2-liter LS V-8s are among the most popular production engines today that receive stroker kits. Both feature a 3.622-inch stroke crankshaft and connecting rods with a 6.098-inch center-to-center distance.

How long will a 6.0 Power Stroke last? ›

With proper maintenance, regular use and EGR system and oil cooler remedies, a 6.0L Power Stroke can be made to blow past the 300,000-mile mark with few, if any issues. The engine might need an injector or two along the way, or an EGR valve, but it can done.

Which 6.0 LS has aluminum block? ›

The L76 is a 6.0L, Gen. 4, aluminum small block engine used in both GM cars and trucks from 2007 to 2009.

What does LS stand for Chevy? ›

LS stands for “luxury sport” and is what is featured in the names of most of the base models in the Chevy lineup. You'll find the LS label in certain trims of the following Chevy models: Chevy Trailblazer. Chevy Trax.

What does the LS stand for? ›

LS stands for Luxury Sport.

What is the difference between LS and Vortec? ›

What Is The Difference Between a Vortec and an LS Engine? Nothing really. Engines with the LS designation were typically set up for passenger car duty while the Vortec line was for GM's SUV and truck lines.

What size block is a 6.0 LS? ›

The 6.0L block—used in the LQ4, LQ9, and LY6—is the most popular with hot rodders. It features a 4.000-inch bore and can be purchased brand new for $800.

What year is a Gen 3 6.0 LS? ›

Generation III (1997–2007)

What is the difference between the 6.0 Vortec and the 6.0 Vortec Max? ›

What's the difference between Vortec and Vortec MAX? The standard 6.0L Vortec had LQ4 and LY6 engine code, while the Vortec MAX used the LQ9 engine code. In late 2006 the LQ9 Vortec MAX was replaced with the L76 engine code which had a slightly higher horsepower output.

What is the gas mileage of a 6.0 Chevy? ›

Highway mpg 14-15. It was a 2015 3500 6.0 CC, 4X4. Great truck, I would do it again.

Is a Chevy 6.0 a good motor? ›

Low oil levels can lead to excessive wear and tear on the components in your engine which will lead to it wearing out faster. Chevy's 6.0L engine is known to be a very dependable engine and is considered to be one of the best engines that Chevrolet ever put in their trucks and SUVs.

What engines make 500 HP? ›

  • BluePrint Engines GM 400 ci. ...
  • BluePrint Engines GM 400 ci. ...
  • ATK LS3 415CI 620HP Base LS02 Engine. ...
  • ATK GM LM7 383 Stroker 540+ HP Base LM7-LB-4 Engine. ...
  • ATK GM LM7 347CI 500HP Base LM7-LB-2 Engine. ...
  • ATK LS 408 Stroker Engine 620HP LS3 Alum LS02C. ...
  • BluePrint Engines GM 496 ci. ...
  • BluePrint Engines GM 496 ci.

What is the highest street legal horsepower? ›

Koenigsegg Regera: 1,479hp. Tesla Model S Plaid: 1,020hp. Dodge Demon: 840hp. Ferrari 812 Superfast: 800hp.

What is the most powerful small block V8? ›

Gen-V LT5: The Most Powerful Small-Block Engine to Date!

The C7 Corvette went out with a big, supercharged bang: the ZR1, powered by the 6.2-liter LT5. It's a beastly thing, cranking out 755 horsepower courtesy of a 2.65-liter Eaton supercharger.

Which is better small block or LS? ›

LS engines are the modern version of a small block Chevy, therefore they are overall a superior engine build right out of the box. But that doesn't always mean it's the right fit for your project.

Is a big block faster than a small block? ›

Big block engines are larger in size and weigh more, but they produce more consistent power and torque to overcome the weight. Small block engines are smaller for better acceleration and handling, but more recently built models can be just as powerful as big block engines.

What is faster a big block or small block? ›

Pros of big block engines

Before you buy a big block engine, it's good to know what you're getting into. More power: Big block engines often have more and larger cylinders, translating into more and larger explosions. These crank the engine harder and faster, generating more power.

What is the best LS block to build? ›

“For your basic hot rodder looking for an LS block and a nice performance build, I would just go with Dart's LS Next block and be done with it – they're very good,” he says. Both Wright and Jones agree that Dart makes an excellent aftermarket option, and it improves deficiencies seen in the factory GM blocks.

Which LS has the strongest block? ›

BMP claims its cast-aluminum (357-T6) LS block is, “the absolute strongest available with important improvements that even the factory race blocks don't have.” The oiling system is priority-main, meaning that oil gets fed to the crank first and the top end last to prevent starving the main bearings of oil.

What is the max bore for LS engine? ›

Speaking of bore size, LSNext aluminum and cast iron blocks start at 4.00in and 4.125in versions, and can be bored as large as 4.185. The LS Next iron, non-skirted race blocks can be bored as large as 4.200in while the cast-iron SHP blocks have a max bore of 4.185in. Aluminum blocks can go as large as 4.165in.

How much horsepower does a Cammed LQ9 have? ›

LQ9 Performance Specifications
Engine Ratings
Compression Ratio10.1:1
Horsepower Rating345 hp
Torque Rating380 ft./lbs.
Feb 2, 2018

What did the 6.0 LQ9 come in? ›

It was introduced in 2002 for the Cadillac Escalade. It was available in the Escalade and GM pickups until 2007. The LQ9 was also known as the Vortec HO 6000 or the VortecMAX.

How many miles will a LQ9 last? ›

Despite the GM 5.3 LQ9 engines becoming increasingly popular with auto enthusiasts, they still can be found for a decent price. Reliability among these engines has been proven through daily drivers known to go over 200k miles without any issues.

What vehicles have a 6.0 LQ4 engine? ›

The LQ4 is found in GMC Yukons and Sierras, Hummer H2s, and Chevy Suburbans, Silverados and Expresses. The LQ9 is the high-output version of the LQ4, originally designed for Cadillac Escalade models.

Can you stroke an LQ4? ›

While the factory LQ4 comes through with a generous displacement of 366 ci via the stock 4.00x3. 62-inch bore and stroke, one of the appeals of these engines is how readily they take to added displacement via a stroker crank.

Is LQ4 fuel injected? ›

LQ4 Chevy LS V8, Electronic Fuel Injection.

What LS can handle the most HP? ›

The LS9 engine made 638 HP at 6,500 RPM and 604 lb-ft of torque at 3,800 RPM. These huge power numbers in the lightweight Corvette body meant it was capable of hitting 60 MPH in just 3.4 seconds. The acceleration didn't slow down after that as 100 MPH came up in 7 seconds.

How much HP can a 6.0 Vortec make? ›

Chevrolet 6.0 Vortec Engine Technical Specifications
EngineVortec 6000
ValvetrainOHV, 16V (2 valve/cylinder)
Compression Ratio9.4:1 – 10.7:1
Horsepower Output300-360 horsepower
Torque Output360-390 lb-ft of torque
8 more rows

How much HP does a tuned 6.0 have? ›

Our own testing of custom 6.0L tuning yielded 415-420 hp on the rollers—right smack-dab in the middle of what most folks see. By comparison, off-the-shelf universal tunes typically lay down somewhere between 360 and 380 hp.

How much HP can a LS engine handle? ›

The stock crankshaft can handle about 900 hp and 7,000 rpm (for a limited time). A forged crankshaft upgrade will add strength to the bottom end.

What is the best LS motor to build? ›

The most abundant and lowest-priced LS engines are the 4.8-liter and 5.3-liter version found in Chevy / GMC trucks and SUVs from 1999 to 2013. If you're looking for a cheap LS build, these engines are the best candidate.

Which LS engine is best for swaps? ›

The Chevrolet LS V-8 is the first choice for high-performance engine swaps. The legendary engine's compact size and light weight make it the most popular option for enthusiasts seeking more power.

How much HP is 20 psi of boost? ›

The formula works at lower and higher boost levels, as 7.35 psi (1⁄2 atmosphere) should increase the power output by 50 percent to 525 hp. Adding 10 psi should increase the power output of our 350hp 5.0L by 68 percent to 588 hp, while 20 psi will yield an increase of 136 percent to 826 hp.

How much can the 6.0 Vortec Max pull? ›

Chevy Silverado 2500 Powertrain and Towing Capacity

The standard engine is the Vortec® 6.0L V8. This engine delivers 360 horsepower and 380 lb-ft of torque. It also has a maximum towing capacity of 14,800 pounds when properly equipped.

What's the difference between a 6.0 Vortec and a 6.0 Vortec Max? ›

What's the difference between Vortec and Vortec MAX? The standard 6.0L Vortec had LQ4 and LY6 engine code, while the Vortec MAX used the LQ9 engine code. In late 2006 the LQ9 Vortec MAX was replaced with the L76 engine code which had a slightly higher horsepower output.

How much HP can a stock tune add? ›

For a general stock car (i.e. no additional performance parts), a tune will boost your hp by 10 to 15 percent. What's more is that if you've added performance parts to your vehicle such as cold air intake, exhaust, or turbo, the hp boost you gain from tuning may be as high as 50 percent more!

How much HP does a professional tune add? ›

In general, most cars will see a horsepower gain of 10-20% from an ECU tune. However, some cars may see a gain of up to 50% or more.

How much HP does a turbo add to a LS? ›

In general, adding a turbocharger to an engine will add anywhere from 40 hp to 300 hp, but in some cases, much more. In my eyes, a healthy boost of power would be around 50%.

What makes a LS motor so special? ›

They have a cracked cap that—by means of an irregular mating surface—allows the rod cap to align precisely with the big-end, helping equalize bearing wear, and they are far stronger than production rods from earlier engine architectures.

What are the weaknesses of LS engine? ›

Some LS variants have been plagued with bad piston-ring seals. This issue can cause oil-consumption issues. As this issue gets worse it can also create an increasing amount of blow-by in the engine. The stock oil pump is known to start cavitating above 6,000 rpm.


(Richard Holdener)
2. Building a 1,300hp LS Short Block - Easy Horsepower
(That Engine Guy)
3. Speed Secrets: Swapping a Cam in a Carbureted LS Crate Motor
(COMP Cams)
(Richard Holdener)
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Author: Corie Satterfield

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Name: Corie Satterfield

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Introduction: My name is Corie Satterfield, I am a fancy, perfect, spotless, quaint, fantastic, funny, lucky person who loves writing and wants to share my knowledge and understanding with you.