Ls7 Vs Ls3 Engine (Difference With Table)

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The engine is the heart of a car. This is true even in the automotive industry, where many standout engine models have been gracing the market over the years. One of them is GM’s LS small-block engines. There are several models under this series, but our focus lies on LS3 vs. LS7 for this article; these two high performers seek to see which one performs better than its predecessor in terms of performance and fuel economy.

It is important to compare the two engines in terms of their specifications. The LS3 and LS7 are derivatives of the LS2 engine, which has many similarities with LS3 and LS7. They are both aluminum builds, with some parts being steel and titanium. This makes them durable and light- crucial features for this car part! Both engines use the 58X ignition system, which comes in handy in ignition timing.

Ls7 Vs Ls3 With Table

DefinitionCast aluminum with six-bolt, cross-bolted main capsThe LS3 engine is a 4th generation small block engine from General Motors.
Camshaft Duration211° is the intake temperature, and 230° is the exhaust temperature.204° is the intake temperature, and 211° is the exhaust temperature
Part number1932924619369326
Rocker Arms ExInvestment-cast is a brand of roller trunnion.Investment-cast is a brand of roller trunnion.
Maximum recommended rpm70006600
Cylinder HeadsCNC ported LS7-style ports; 70-cc CNC combustion chambers.Aluminum L92-style port; “as cast” with 68cc chambers.
Engine TypeLS-Series small-block V-8 engineLS-Series Gen-IV Small-Block V-8
CrankshaftForged steelNodular Iron
Valve size2.200 titanium intake and 1.610 sodium-filled exhaust 2165 intake and 1590 exhaust
Reluctor Wheel58X58X
Recommended FuelPremium PumpPremium Pump
BlockCast aluminum with six-bolt steel main bearing capsCast-aluminum with six-bolt, cross-bolted main caps
PistonsHypereutectic aluminumHypereutectic aluminum
Compression ratio11.
PriceLs7 price is around $14000-$17000Ls3 engine price is around $7000-$13000

Ls7 Vs Ls3 With Features


The LS3 engine’s power output is based on its displacement and horsepower. The 6.2-liter LS3 has 430 horsepower and 456 pounds per foot of torque. With modifications, it can reach 436 horsepower! Meanwhile, the 7-liter LS7 with 505 horsepower has a possible 570 hp.

Camshaft Duration

The Ls7 engine has a 211° intake temperature and a 230° exhaust temperature. The Ls3 engine has a 204° intake temperature and a 211° outlet Temperature.

Cylinder Heads

The LS7-style ports are CNC ported to provide a more finished look and feel. Ls3 aluminum L92-style port is “as cast” with 68cc chambers, providing users with an even more finished product. Additionally, the LS3 Aluminum L92-style port provides users with a high-performance engine that is perfect for small applications or racing purposes.

Engine Type

Ls7 engine LS-Series small-block V-8 engine is a powerful and reliable engine used by many automakers. It provides excellent performance for both street and race cars, making it the perfect choice for drivers who want to get the most out of their cars. An LS3 engine is also a great option if you’re looking for an affordable alternative to high-end engines like the Camaro SS or Corvette Z06.


The Ls7 engine is Cast aluminum with six-bolt steel main bearing caps. This engine is built to last and provide a high level of performance. It has a cast aluminum alloy housing, which makes it durable and efficient. The 6-bolt steel main bearing caps ensure that the engine will be long-lasting and reliable.Ls3 engine Cast-aluminum with six-bolt, cross-bolted main caps.

Valve size

The LS7 engine is a high-performance, aluminum-alloy V8 engine that was designed for the Corvette. It features a 2.200 titanium intake and a 1.610 sodium-filled exhaust manifold. The Ls3 engine also has a 2165 intake and 1590 exhaust manifold.


You should analyze the price of a car part before choosing it. While you may want to go for the cheapest component, you should focus on factors such as cost. The LS3 engine price is around $7000 to $13000, depending on your dealer. On the flip side, the LS7 engine Price ranges from $14000 to $17000.

Similarity of Ls7 Vs Ls3

Rocker Arms Ex

Ls7 and Ls3 engines both are Investment-cast. This means that they are both casts in very high quality, durable, and expensive material. They also use the latest technology to make sure that the engines run smoothly and efficiently.

Both the Ls7 and Ls3 engines both recommend premium fuel for their engines. The reason behind this is that premium fuel gives these engines a higher octane rating, which in turn results in increased power and performance.


The aluminum alloy ls7 is a high-strength, corrosion-resistant piston that has been developed for use in hydraulic systems. It was designed to resist wear and tear caused by the repeated movement of parts inside and outside of hydraulic systems. The alloy also offers good heat resistance, making it ideal for applications such as power transmission plants or water turbines.

Ls7- Best for Performance

The LS7 has a legendary status in the auto-mechanic scene for its excellent performance. It is among the few General Motors’ handmade engines, making its debut in 2006, earlier than the LS3. This fourth-generation GM engine uses aluminum and cast steel instead of plastic or metal to ensure durability and lightness. The bore is quite similar in size to that of the LS7, giving it a higher displacement of 7 liters.

Ls3- Best for Money

It’s important to keep in mind that the LS3 engine is a high-quality engine and it will give you good performance. However, if you’re looking for a cheaper option, it’s the best option for you. You should compare prices before making your purchase so that you can get the best deal possible. The LS3 engine is a high-performance, fuel-efficient engine that produces 375 horsepower and 460 lb-ft of torque. It also comes with an impressive list of features, such as a 7-speed automatic transmission, alloys for better performance and durability, and heated seats. If you’re looking to buy the cheapest car part possible without compromising on quality or performance, it’s important to look at the LS3 engine price first.

Pros and Cons of Ls7


  • High performance of 505 horsepower
  • The engine is light and durable due to its aluminum construction
  • It is very easy to maintain and repair. 
  • Enhanced performance and good fuel economy


  • Ls7 engine encounter on most LS engines While this issue is typically caused by cavitation issues.
  • The price is a little bit higher than Ls3

Pros and cons of Ls3


  • Power of 430-horsepower before any boosting.
  • Prominence in muscle and power cars.
  • LS3 is its aluminum build. Aluminum is strong and light.
  • A 6.2-liter engine with a wide bore width means it can easily fit into most vehicles.


  • A common problem with the LS engine types is piston ring faults.
  • The compact size of LS3 engines makes maintenance difficult.


Which is better: LS3 or LS7?

Which is better, the LS7 or the LS3? The LS7 is better if you want a high power output, where it gives you 505 horsepower. With improvements, you can achieve more power around 570 hp. The LS3 is also great in power output, though, at 430 horsepower, it is lower than the LS7.

What is the difference between Ls7 and Ls3?

The LS7 and LS3 have several physical differences that can help you know which one you have under your vehicle’s hood. First of all, the LS7 has a larger exhaust port than that of the LS3. The Ls7 tubes seem closer to the throttle body, whereas those of the LS3 are thicker and appear to be higher set from the throttle body.

Can you put Ls7 heads on an Ls3?

Yes, you can fit an LS7 on LS3 heads, and it will perfectly fit. However, the valves may fail to clear, affecting their functionality.

Final Words

We are going to tackle the LS series from General Motors. The LS3 vs. LS7 debate is a clear-cut question that needs to be answered so you can understand what each of them offers in terms of output and driving experience. You should choose a suitable engine for your desired driving experience based on the answer given in this article.

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