LS Engine Wiki: Specifications, Variants, and Performance

The LS engine family is a series of V8 engines produced by General Motors. They're known for their high performance and versatility.

The LS engines were first introduced in 1997 and have since become a popular choice for many applications. They're used in a wide range of vehicles, from Chevrolet Corvettes to Cadillac Escalades.

The LS engine family includes several variants, each with its own unique characteristics. The LS1, LS6, and LS7 are some of the most well-known variants, with the LS1 being the base engine and the LS7 being the most powerful.

The LS engines are known for their high performance capabilities, with some variants producing over 500 horsepower.

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The LS engine series is known for its versatility and wide range of applications. The smallest engine in the series is the 4.8 liter engine found in some trucks.

The LS-series engines range in size from the 4.8 liter engine to the 454 CI LSX engine available from GM Performance Parts. The largest engine in the series is the 7.0 liter LS7 engine, which is rated at 505 HP.

Here's a list of some of the most notable LS engine specifications:

The L8T engine, which is part of the Gen V family, has a displacement of 6.564 L (400.6 cu in) and is rated for 401 HP at 5,200 rpm.

The 6.6 L engine, also known as the L8T, is the first iron block member of the Gen V family and a successor to the 6.0L Gen IV L96.

It shares its 103.25 mm (4.065 in) bore with other 6.2L V8s, but with a longer stroke of 98 mm (3.9 in) to displace 6.564 L (400.6 cu in). The engine is rated for 401 hp at 5,200 rpm and 464 lb⋅ft of torque at 4,000 rpm.

The compression ratio is 10.8:1, and the engine requires only 87 Octane fuel. This is a significant improvement over other engines in the Gen V family, which often require higher-octane fuel.

The L8T's design was specifically tailored for the heavy-duty truck market, with features like a longer stroke and rod ratio, lower compression, and a forged crankshaft with central counterweights.

Here are some key specifications of the L8T engine:

Overall, the L8T engine is a robust and reliable powerplant that's well-suited for heavy-duty truck applications.

The 3921 In engine has been in production since 2014. It's a powerful unit that deserves some attention.

The 3921 In engine produces 455 horsepower and 455 lb-ft of torque. This is a significant increase from its predecessor.

This engine is paired with a 8-speed automatic transmission, which helps to optimize its performance.

Cathedral Port Heads are a type of cylinder head used on many LS engines. They were first introduced on the LS1 engine and feature a distinctive shape to their intake port.

The most common cathedral port head casting number is 241, which was used on every 4.8L and 5.3L truck engine as well as early LS1s. These heads have 67cc chambers and 2.00/1.55-inch valves.

LS1 heads are only compatible with LS1, LS6, and LS2 cathedral port heads due to varying bore and valve sizes. LS2 engines can also run LS3/L92 heads, but not LS7 rectangular-port heads.

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You can identify the casting number near the corner of the head, which will help you determine the specific type of head you have. Some common cathedral port head casting numbers include 241, 852, 706, and 799.

Here's a list of some common cathedral port head casting numbers:

Keep in mind that not all 243 heads are LS6 heads, but all LS6 heads are 243 castings. True LS6 heads will have stainless steel hollow-stem valves.

The LS4 engine is a good choice if you need a transaxle swap LS, as it's centered around a 5.3-liter aluminum block.

These engines were rated at 303 horsepower and were found in front-wheel-drive Pontiac Grand Prix GXPs and Chevrolet Impalas.

The LS4 has different transmission mounting points compared to other LS engines, making it a less desirable swap candidate if you don't need a transaxle swap.

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The LSX376-B8 crate engine is an affordable foundation for forced induction race engines, suitable for lower-boost applications up to about 8 pounds.

You can also consider the LSX-454 and LSX-454R, the biggest aftermarket LS engines offered by Chevrolet Performance, which churn out 627 hp and over 700 hp respectively.

The LS376-B15 is durable and supports up to 15 pounds of boost, making it a great option for those who need a bit more atmosphere added to the equation.

These engines are designed to be used with production-based applications, making them perfect for supercharger and turbo kits.

The LSX-454R, in particular, is a solid-roller, race-prepped mill that revs to 7,100 and puts out over 700 hp, but it comes with a hefty price tag of around 20 grand.

The LS engine family is incredibly diverse, with over a dozen variants to choose from. The most common LS engine on the planet is the LC9, a 5.3-liter displacement engine with a 327 cubic inch displacement.

LS engine variants can be broadly categorized into different generations, with Generation III being one of the earliest and most widely used. The LS1 and LS6 engines, for example, are part of this generation and can only run LS1, LS6, and LS2 cathedral port heads.

The LS engine family also sees a lot of variation in cylinder head design, with some engines using cathedral port heads and others using rectangular port heads. The LS3 engines, for example, can run any head except the LS7 rectangular-port heads.

The LY6 engine was a Generation IV small-block V8 truck engine produced from 1999 to 2007. It had a cast-iron block and featured variable valve timing.

This engine shared the same bore and stroke as its LQ4 predecessor. The LY6 generated 361 hp at 5,600 rpm and 385 lb⋅ft of torque at 4,400 rpm using regular gas.

Redline for the LY6 engine was 6,000 rpm. The compression ratio was 9.6:1.

The LY6 used L92/LS3 style rectangle port cylinder heads without the sodium-filled exhaust valves of the LS3.

The Vortec and LS engines are often used interchangeably, but they were originally designed for different purposes.

The main difference between the two is in their intended use, with the LS line geared towards passenger cars and the Vortec line for GM's SUV and truck lines.

In reality, the distinction between the two is largely marketing-driven, and many people use the term LS to refer to both the LS line and the Vortec engines.

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To determine whether a Vortec or LS engine is in front of you, look for the presence of electronic throttlebodies, which are a characteristic of Gen IV motors.

Gen IV motors also have the cam sensor in the timing cover, whereas Gen III engines use cable-operated throttles and have the cam sensor in the back of the block.

A Gen III engine will have two knock sensors under the valley plate, whereas a Gen IV engine has them fitted to the side of the block.

The valley plate on a Gen III engine is also not square at the back, unlike the Gen IV engine.

The crank sensor is another distinguishing feature, with Gen III engines running a black sensor and 24-tooth trigger wheel, and Gen IV engines running a grey sensor and 58-tooth trigger wheel.

The Gen V LT engine family is a significant departure from the LS engine variants we've been discussing.

The LS7 engines can run any LS-series head, but running the smaller heads would be nonsensical from a performance standpoint.

One of the key differences between the LS7 and other LS engines is the use of rectangular ports, which provide a straight-through airflow and utilize 270cc intake ports.

The LS7 heads (452 castings) employ rectangular ports, a bit wider and shorter compared to the L92/LS3 ports.

The 6.2-liter, L92/L94/L9H-coded engines, which are the closest you'll find to the performance LS car engines, have aluminum blocks and the latest in CAFE-friendly tech such as variable valve timing.

These engines are found in high-end SUVs like the GMC Yukon Denali and Caddy Escalade, and also in the GMC Sierra (SLE/SLT), Sierra Denali, Suburban, Avalanche, and others.

The LS3 engines (or any of the 6.2-liter-based variants like the L92, LSA, etc.) can run any head except the LS7 rectangular-port heads.

To better understand the Gen V LT engine family, let's take a look at some key specs of the various LS engine variants:

The LS engine variants part of the Generation III family are numerous, with dozens of options available after almost 20 years in production.

The LS2 engine, a large evolution of the platform, was given a Gen IV designation, but its roots in Generation III are undeniable.

The LS2 debuted in 2005 in the Corvette, GTO, and SSR, and also found its way into the Trailblazer SS and the Holden-based Pontiac G8 GT.

The increased displacement of the LS2 meant more power, and its increased bore size allowed it to work with LS1/LS6 heads as well as the newer LS3/L92 versions.

The LS2 blocks are great for stroking, and a 4.000-inch crank will make a 408.

The LS engine is a marvel of modern engineering, and its components are just as impressive. The engine features a 90-degree V6 configuration, with a 4.8L, 5.3L, 5.7L, or 6.2L displacement.

The LS engine's cylinder head is a key component, and it's made of aluminum. It has 16 valves, with 4 valves per cylinder, and a dual overhead camshaft design. This design allows for more efficient airflow and better performance.

The engine's crankshaft is also noteworthy, with a forged steel construction that provides added strength and durability. The crankshaft is also counterweighted, which helps to reduce vibration and improve overall engine balance.

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The intake manifold is a crucial component of your engine, and it's great that the LS-series engines have a symmetrical design. This means you can flip the intake manifold around to re-position the intake opening from the front to the rear of the engine, which can be helpful when working with limited clearance.

The LS-series intake manifolds can be flipped, but be aware that you may need to modify the valley cover or purchase a modified one, as the oil pressure sender boss can foul when the manifold is flipped.

If you're looking to flip your intake manifold, Katech offers modified valley covers that can help. The oil port on the manifold is located on the picture, so be sure to check that out if you're planning to make any modifications.

One thing to keep in mind is that the LS-series intake manifolds are designed to work with various heads, including the LS Cathedral Port Heads. These heads have a distinctive shape to their intake port and can be used with any intake manifold, including the LS1, LS6, and LS2 manifolds.

Here's a list of some common intake manifold types:

PCV and venting systems are crucial for keeping your engine clean and running smoothly. A well-designed PCV system can help to reduce oil consumption and prevent engine damage.

For dry sump systems, venting is often built-in, but you may need to consult with Peterson Fluid Systems or your supplier for specific information on breathers for LS engines.

Wet sump engines, on the other hand, often require additional crankcase venting, especially at higher RPMs. This can cause smoking at cold idle and dirty spark plugs.

Using two catch cans can be a simple and effective solution for wet sump engines, as seen in typical LS engine crankcase venting systems.

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The LS Rectangular Port Heads are some of the best LS heads ever made, far outflowing their cathedral port cousins. They feature a rectangular port design, which is also found on some 6.0-liter truck engines and the Pontiac G8 6.0-liter mill.

These heads use an offset rocker on the intake side due to an enlarged intake valve. The main difference in the various heads is the type of valve used. The LS3 821 heads had hollow-stem valves, as did the LSA supercharged engine with the 863 heads.

LS9 heads, on the other hand, used titanium intake valves like the LS7. The main difference between an LSA and an LS9 head is the valves as well—the LSA heads used a stronger rotocast A356-T6 alloy.

Here's a list of some common LS Rectangular Port Heads:

These heads are known for their high performance capabilities, easily supporting over 600 hp naturally aspirated. They require a specific intake manifold, such as an LS7 intake manifold or an aftermarket equivalent.

All LS cranks are of the same design and have 2.10-inch rod and 2.65-inch main journal sizes.

The LS cranks are all iron, except for the LS9, LS7, and LSA cranks which are forged steel.

LS7 cranks have a 4-inch stroke, while all the rest have a 3.62-inch stroke, except for 4.8-liter cranks which are 3.27-inch.

LS7 and LS9 (dry-sump) cranks have a longer snout, about 1 inch, for their two-stage oil pumps.

The reluctor wheel used for crank timing is a key difference between LS cranks, with early ones having a 24x wheel and later cranks having a 58x wheel.

The reluctor wheels can be changed by any qualified machine shop.

Most LS rods are interchangeable and made from powdered metal. This means you can swap them out with minimal hassle.

The exceptions are LS9 and LS7 rods, which are forged titanium and only work with LS7/9 pistons. This is a key thing to keep in mind when shopping for rods.

The common length of LS rods is 6.098 inches, except for 4.8-liter engines, which use 6.275-inch rods. This is a crucial measurement to note when selecting rods.

LS7 rods have a unique bearing size that requires a different bearing than other LS rods. This can make a big difference in performance and longevity.

The weak point of all LS rods is the rod bolts, especially on pre-2000 engines. This is something to keep in mind when upgrading or replacing rods.

LS engines generally use hypereutectic aluminum pistons, with the exception of the LS9. These pistons have a pressed-in pin held by an interference fit, requiring a machine shop to disassemble and reassemble them.

The diameter of the pistons varies due to bore size changes. The compression ratio can also be affected by changes such as a dish.

Gen IV and Gen III LQ9 engines use "full floating" pins held in by locking rings. This design is a departure from the pressed-in pins used in earlier models.

Cast pistons don't like detonation and are suitable for engines producing up to 550-600 hp.

The LS7 engine, used in the C6 Corvette Z06, features a unique dry-sump system. This system is a first for GM and provides improved engine performance.

The LS7's dry-sump system is actually a hybrid dry/wet oiling system, which helps to increase engine power. The engine churns out 505 rated horsepower.

The dry-sump system is a key component of the engine's high-performance capabilities. It's designed to work in conjunction with other race-ready parts and tech to deliver exceptional power and efficiency.

The LS7's titanium intake valves and rods also contribute to its impressive performance. These high-quality components help to increase engine power and efficiency.

The LS7 was hand-assembled at the GM Performance Build Center in Wixom, Michigan, which ensures a high level of quality and attention to detail.

The fourth-generation V-8 design is a significant improvement over its predecessors.

The LS3 engine, introduced in 2008, is a prime example of this design's capabilities. It features a 6.2 liter displacement and 376ci of cubic inches, making it a powerhouse on the road.

The LS3's increased power output of 430 horsepower is a notable upgrade from previous models.

The engine block of the LS3 was strengthened to handle the power of the supercharged LS9 engine in the ZR1 Vette.

In 2010, the Camaro SS received the LS3 engine, which produced 426 horsepower in manual transmission-equipped cars.

Replacing a water pump is a relatively straightforward process, but it does require some mechanical know-how. The LS engine's water pump is mounted to the center of the front of the engine.

The water pump is attached with six bolts, with three per gasket/side, making it a bit of a challenge to remove. It's essential to have a good understanding of the engine's configuration before starting the replacement process.

Some models of the LS engine have a belt tensioner mounted to the water pump, which can make it even more complicated to remove. The thermostat/water outlet is also often attached to the pump, adding an extra step to the replacement process.

The six bolts holding the pump in place need to be removed carefully to avoid damaging the engine's gaskets or other components. It's a good idea to have a replacement gasket on hand to ensure a smooth installation process.

The LS engine has a rich history, and its applications span across various GM models. The LS2 engine, for example, was a large evolution of the platform, debuting in 2005 in the Corvette, GTO, and SSR.

The LS2 engine was given a Gen IV designation and came in various horsepower ratings, including 400 hp in the Corvette, 350 hp in the GTO, and 390 hp in the SSR. It also found its way into the Trailblazer SS and the Holden-based 2008 Pontiac G8 GT.

The LS2 engine had a 6.0 liter displacement and was known for its increased bore size, which allowed it to work with LS1/LS6 heads as well as the newer LS3/L92 versions.

The LS engine fits well in the engine bay, but like all powerplants has a few fitment quirks.

In fact, the LS engine's fitment can be improved with some careful planning and modification.

Its compact size makes it a great choice for smaller engine bays, but it still requires some creative problem-solving to get it to fit just right.

With the right tools and some patience, you can get the LS engine to fit snugly into even the most cramped engine bay.

The LS6 engine is a notable variant of the LS family. It has the same displacement as the LS1, but with different cylinder heads for improved intake and exhaust flow.

One of the key differences between the LS6 and other LS engines is its cylinder head design. The LS6's cylinder heads are optimized for better airflow, which can result in increased power output.

The LS6's improved airflow capabilities make it a popular choice for high-performance applications. Its displacement remains the same as the LS1, which is a significant factor in its overall design.

In terms of its overall design, the LS6 engine is a testament to the engineering capabilities of the LS family. Its unique cylinder head design sets it apart from other engines in the series.

The Chevy Performance LSX376-B8 crate engine is a great foundation for forced induction race engines. It's an affordable option that's perfect for those who want to add a supercharger or turbo kit to their vehicle.

This engine is designed for lower-boost applications, up to about 8 pounds, making it suitable for most supercharger and turbo kits. The LSX376-B8 features 9.0:1 forged pistons and the LS3's high-flow, rectangular-port heads.

GM's Gen III and Gen IV small-block V8s are incredibly versatile engines that can be easily modified to produce impressive results. With the right bolt-on mods, these engines can really sing.

The LS engine family is incredibly easy to work with, thanks to the huge aftermarket support and small engine size. This makes it possible to fit an LS engine into even the smallest of cars, like a Mazda Miata.

Cars can be swapped with crate engines, and it's surprisingly easy. Chevrolet Performance's E-Rod program made it possible to swap emissions-legal engines into newer cars.

The LS engine family is particularly popular for swaps due to its huge aftermarket support and compact size. This makes it easy to stuff into anything from small cars like a Mazda Miata to boats and airplanes.

Emissions-legal crate engines like the E-Rod LS3s and LSAs are designed to be swapped into newer cars, making it possible to drive them on the road without worrying about emissions regulations. Chevrolet Performance even offered 5.3-liter versions of these engines in the early days of the E-Rod program.

The L20 4.8L Vortec Iron Block is a unique engine that shares its iron block with the 5.3-liter engine, with the same 3.78-inch bore size.

This engine is the smallest LS ever produced, with a displacement of 4.8 liters or 293ci. It's impossible to tell it apart from a 5.3-liter engine from the outside.

The 4.8-liter engine has a shorter stroke crank, measuring 3.27 inches, which accounts for the drop in displacement compared to the 5.3-liter engine.

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The LC9 5.3-Liter is the most common LS engine variant on the planet. Its 5.3-liter displacement is equivalent to 327 cubic inches.

This engine has a longer 3.62-inch stroke, which sets it apart from the 4.8-liter variant. Later versions of the LC9 received Active Fuel Management.

The LC9's aluminum heads are a standard feature, just like all other LS variants. Some applications of the LC9 even received aluminum blocks, which is a notable upgrade.

The LSX-454 is a beast of an engine, capable of producing 627 hp in its standard form. This is a significant amount of power, especially considering its compact size.

For those looking to take their engine to the next level, the LSX-454R is a solid-roller, race-prepped mill that revs to 7,100 rpm and puts out over 700 hp. This level of performance comes at a price, with a tag of around $20,000.

The LSX-454 and LSX-454R are both offered by Chevrolet Performance, making them a great option for those looking to upgrade their engine.

The 376/515 crate engine is a beast, with a rating of 533 hp and 477 lb-ft of torque. It uses the LS3 engine as its foundation, which is a great starting point for any build.

This engine is carburetor-ready, which means you can ditch the fuel injectors and go old-school with a carburetor. The carbureted intake system and spider-type carburetor intake manifold are designed to work together seamlessly.

The LS376/515 also features a racing-derived ASA Hot Cam, which is a significant upgrade over the standard camshaft. This camshaft is designed to give you more power and better performance.

One thing to note is that this engine is designed for carburetors, so if you're planning to go with fuel injectors, you'll need to look elsewhere.

The LS7 engine is a beast, with a 7.0L V8 performance engine that's hand-built by the General Motors Performance Build Center in Wixom, Michigan.

This engine has a larger bore and stroke than the LS2 before it, making it a significant upgrade for those looking for more power.

One thing to note is that the LS7 is a performance engine, built for speed and power rather than everyday driving.

The LS engine family has a long history, and understanding the different engine generations and variants can be a bit overwhelming. The LS engine variants part one – Generation III is a good starting point, as it explains that after almost 20 years in production, there are dozens of LS engine variants.

The most common LS engine variant is the LC9 5.3-Liter, which has a displacement of 327 cubic inches. It's worth noting that the longer 3.62-inch stroke of this engine separates it from the 4.8-liter variant. Aluminum heads are a common feature across all LS variants, including the LC9.

Active Fuel Management was introduced in later versions of the LC9, and some applications even received aluminum blocks. This shows how the LS engine family has evolved over time to meet changing needs and requirements.

The LS376-B15 engine is built to handle more boost, supporting up to 15 pounds of boost for even greater performance.

A stock LS1 Pontiac GTO dyno run was filmed at East Windsor, Connecticut, and features footage of a 2004 Pontiac GTO on a Mustang dyno.

The LS2 engine has a displacement of 6.0L (364 CI) and a compression ratio of 10.9:1, making it a strong performer.

The typical output of an LS2 engine is 400 HP, which is impressive for a naturally aspirated engine.

The LS7 engine has a displacement of 7.0L (427.8 CI), making it a powerhouse of an engine.

Here's a comparison of the LS2 and LS7 engines:

The LS2 and LS7 engines both have a wet sump oil system, which is a reliable and efficient design.

The LS2 engine features electronic throttle control, which provides precise control over engine speed.

The LS7 engine, on the other hand, does not have any specific information about its throttle control system mentioned in the provided article section examples.

The LS engine series is known for its versatility and power, but what exactly sets these engines apart? The LS1 engine, for instance, has a displacement of 5.7 liters (346ci).

The compression ratio of the LS1 engine is 10.2:1, which is relatively high compared to other engines. This allows for a more efficient burn of fuel, resulting in better performance.

One of the key differences between the LS1 and LS6 engines is the horsepower and torque output. The LS6 engine produces 385-405 horsepower and 400 lb-ft of torque, making it a popular choice for high-performance applications.

The bore and stroke of the LS engine series are typically 3.89 x 3.62 inches, but this can vary depending on the specific engine model. The LSA engine, for example, has a bore and stroke of 4.065 x 3.622 inches.

Here's a breakdown of the main specifications of some popular LS engine models:

The LS engine series also features a range of oil system configurations, including wet sump systems. The LS7 engine, for example, uses a wet sump oil system.