LS2 vs. LS6: Difference Between Two Popular Engine

The GM LS engine is a popular choice for engine swaps because it is powerful and reliable. The LS2 and LS6 are two of the most popular engines in the LS family. Both engines are different generations of the LS engine, but they share many similarities. So, which one is better? The LS2 is the newer engine and offers more power and better fuel economy.

However, the LS6 is still a great engine and provides good power and reliability. Ultimately, the decision of which engine to choose depends on your specific needs and preferences.

LS6 vs LS2

The Basics


An LS2 is a 6.0-liter V8 engine produced by General Motors for use in high-performance vehicles.

The LS2 was introduced in the 2005 Chevrolet Corvette and was also used in the 2006 and 2007 Chevrolet Camaro SS. It is based on the LS1 engine, with several changes to increase power and durability. These changes include a new block, cylinder heads, connecting rods, and pistons.

The LS2 was replaced by the LS3 in 2008. The LS6 is a 7.0-liter V8 engine produced by General Motors for use in high-performance vehicles. The LS6 was introduced in the 2002 Chevrolet Corvette and was also used in the 2004 and 2005 Chevrolet SSR.

It is based on the LS1 engine, with several changes to increase power and durability. These changes include a new block, cylinder heads, connecting rods, and pistons. The LS6 was replaced by the LS7 in 2006.

Cylinder Heads

The LS2 and LS6 engines are known for their great head flow, thanks to the GM 243 heads. These heads are an improved version of the LS1’s 241 heads, and they flow around 210cfm on the intake side and 75cfm on the exhaust side.

The 243 heads also feature hollow valve stems and sodium-filled valves, which are great for forced induction. The LS2 uses the same 243 heads as the LS6, but with a few modifications.

The LS2’s heads don’t have sodium-filled valves, but they still use the LS6 valve springs. The LS2 and LS6 heads are interchangeable with the different bore sizes.

Camshafts

The LS6 cam is the most aggressive cam GM put out for any cathedral port LS engine. It offers more lift, more duration, and a wider lobe separation angle than the LS2 cam, meaning it will allow more air into the engine and theoretically give the LS6 a wider powerband.

If you’re looking for the most performance possible from your LS engine, the LS6 cam is the way to go.

Power Output

The LS2 and LS6 engines are both powerful options, but the LS6 is the more powerful of the two. The LS6 outputs 405hp and 400lb-ft of torque, while the LS2 outputs 400hp and 400lb-ft of torque.

The LS6 makes 5 more horsepower per liter of displacement than the LS2, due to its more aggressive camshaft and other factors. If both engines were 6.0L, the LS6 would make 426hp, rather than 405.

Internals

The LS2 engine features a number of design improvements that make it more powerful and efficient than the LS1 engine it replaced. The pistons have a true flat-top design and full floating wrist pins, which reduces friction and piston slap noise.

The cylinder bores are siamesed, which results in a stronger block that is less prone to heat distortion. These design improvements combine to make the LS2 a more powerful and efficient engine.

Intake Manifolds

The LS2 engine features a significantly improved intake design that allows for better airflow and increased power. The intake runner geometry was optimized for six-liter displacement, and the throttle-body size was increased from 76-mm to 90-mm. The entire induction system was redesigned for lower restriction, resulting in an overall airflow increase of 15%.

However, the stock LS6 intake manifold is actually superior to the LS2’s in terms of performance. This is why many LS engine enthusiasts prefer to swap out the LS2’s intake manifold for the LS6’s.

Pricing

The LS6 and LS2 engines are both popular options for engine builders. The LS6 has better or equal components than the LS2 in most categories, but the LS2 is more affordable due to its rarity. The LS2 is also popular because its block is compatible with high flowing and desirable L92 cylinder heads.

How Do You Decide Which is Better?

In the world of performance engines, there are a few names that stand out above the rest. Chevrolet has been responsible for some of the most iconic engines in automotive history, and two of their most popular offerings are the LS2 and LS6.

Both engines are part of Chevrolet’s LS family of engines, which began production in 1997. The LS2 was introduced in 2004 as a replacement for the previous LS1 engine. It featured an increase in displacement to 6.0 liters, as well as a number of other improvements that made it more powerful and efficient.

The LS6, on the other hand, was introduced in 2001 as an option for the high-performance C5 Corvette. It featured an even larger displacement of 6.2 liters, as well as a number of other upgrades that made it the most powerful engine in the LS family.

So, which one is better? The answer, of course, depends on what you’re looking for. If you want an engine with more power and performance, the LS6 is the clear choice. However, if you’re looking for an engine that’s more efficient and easier on the wallet, the LS2 is the way to go.

Final Word

The ls2 vs ls6 debate has been raging for years, and there is no clear winner. Each engine has its own pros and cons, and it really comes down to personal preference. However, we can provide a final word on the matter.

The ls2 is a great engine for those who want power and performance. It is incredibly powerful and has a lot of torque. However, it is also very loud and can be quite difficult to control.

The ls6, on the other hand, is a bit more subdued. It doesn’t have quite as much power as the ls2, but it is still plenty fast. It is also much easier to control, making it a great choice for those who want a more relaxed driving experience.

So, which is the better engine? Ultimately, it comes down to what you want. If you want an incredibly powerful engine that is also very loud, the ls2 is the way to go. If you want a more relaxed driving experience, the ls6 is the better choice.

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