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The debate between LS and HEMI engines has been a hot topic among automotive enthusiasts for years. Both engine types have their loyal followers, and each offers unique advantages when it comes to building high-performance street engines. In this article, we will compare the LS and HEMI platforms, focusing on building a 600+ horsepower street engine using Summit Racing components.
Understanding the LS Engine
The LS engine family, originating from General Motors, has become synonymous with performance and reliability. The LS series includes several variations, from the LS1 to the LS7, each with its unique features. Here are some key points about the LS engine:
- Lightweight aluminum construction.
- Efficient design with a high power-to-weight ratio.
- Wide aftermarket support for performance parts.
- Versatile for various applications, from street to racing.
Understanding the HEMI Engine
The HEMI engine, developed by Chrysler, is known for its distinctive hemispherical combustion chamber design. This design allows for better airflow and combustion efficiency, making it a popular choice for performance builds. Here are some key points about the HEMI engine:
- Iconic design with a strong heritage in motorsports.
- Robust construction, often with iron blocks for durability.
- Excellent torque characteristics, especially at low RPM.
- Strong aftermarket support for performance upgrades.
Key Differences Between LS and HEMI Engines
While both the LS and HEMI engines have their strengths, several key differences set them apart. Understanding these differences can help you make an informed decision when building your 600+ hp street engine.
- Weight: LS engines are generally lighter than HEMI engines, contributing to better handling and performance.
- Power Delivery: HEMI engines often provide more torque at lower RPMs, while LS engines excel in high RPM power delivery.
- Aftermarket Support: The LS platform has a broader range of aftermarket parts available, making it easier to find components for high-performance builds.
- Cost: LS components tend to be more affordable due to their widespread popularity.
Building a 600+ HP Street Engine
When building a 600+ hp street engine, both LS and HEMI platforms can achieve this goal with the right components and tuning. Here’s a breakdown of the recommended components from Summit Racing for each engine type.
LS Engine Build Components
- Engine Block: Choose an LS3 or LS7 block for a solid foundation.
- Forged Pistons: Summit Racing offers a variety of forged pistons to withstand high horsepower.
- Camshaft: A performance camshaft designed for high RPM power is essential.
- Intake Manifold: An aftermarket intake manifold can improve airflow significantly.
- Fuel System: Upgrade to high-flow fuel injectors and a performance fuel pump.
HEMI Engine Build Components
- Engine Block: Use a 5.7L or 6.4L HEMI block for optimal performance.
- Forged Pistons: Select high-performance forged pistons for durability.
- Camshaft: A camshaft designed for torque and horsepower is crucial for performance.
- Intake Manifold: Consider an aftermarket intake manifold for better airflow.
- Fuel System: High-flow fuel injectors and pumps are necessary for high horsepower builds.
Tuning for Performance
After assembling your engine, proper tuning is essential to maximize performance. Both LS and HEMI engines benefit from custom tuning to optimize air-fuel ratios and ignition timing. Consider the following:
- Use a reputable tuner familiar with your engine platform.
- Invest in a quality engine management system for precise control.
- Monitor engine parameters using data logging to ensure optimal performance.
Conclusion
Both LS and HEMI engines offer unique advantages for building a 600+ hp street engine. The choice ultimately depends on personal preference, intended use, and budget. With the right components from Summit Racing and proper tuning, either engine can deliver thrilling performance on the street.