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When it comes to high-performance engines, the LS and HEMI platforms have become popular choices among enthusiasts and builders. Both engines offer unique characteristics, but the path to achieving 650+ horsepower can vary significantly in terms of build costs and parts choices. This article delves into the comparative aspects of building LS and HEMI engines to reach that impressive power level.
Understanding the LS Engine
The LS engine family, developed by General Motors, is known for its lightweight design, efficiency, and robust performance capabilities. With a variety of configurations available, the LS engine can be tailored to meet specific power goals.
Stock LS Engine Specifications
The stock LS engines typically range from 4.8L to 7.0L in displacement. Here are some common specifications:
- Displacement: 4.8L to 7.0L
- Horsepower: 295 to 505 HP (depending on the variant)
- Torque: 305 to 470 lb-ft
Building for 650+ HP
To achieve 650+ horsepower from an LS engine, several key components must be upgraded. Below are the typical costs and parts choices:
- Engine Block: Upgrading to a forged block can cost between $2,000 and $3,500.
- Pistons: High-performance pistons range from $600 to $1,200.
- Camshaft: A performance camshaft can cost between $300 and $1,000.
- Heads: Upgraded cylinder heads can range from $1,500 to $3,000.
- Fuel System: A high-flow fuel system may cost around $500 to $1,500.
- Exhaust: Performance headers and exhaust can range from $800 to $2,000.
Exploring the HEMI Engine
The HEMI engine, primarily associated with Chrysler, is renowned for its distinctive hemispherical combustion chamber design, which enhances airflow and efficiency. This design contributes to its performance characteristics.
Stock HEMI Engine Specifications
The stock HEMI engines are typically available in 5.7L and 6.4L variants. Here are some common specifications:
- Displacement: 5.7L and 6.4L
- Horsepower: 360 to 485 HP (depending on the variant)
- Torque: 390 to 475 lb-ft
Building for 650+ HP
Achieving 650+ horsepower from a HEMI engine also requires significant upgrades. Below are the typical costs and parts choices:
- Engine Block: Upgrading to a forged block can cost between $2,500 and $4,000.
- Pistons: High-performance pistons range from $700 to $1,500.
- Camshaft: A performance camshaft can cost between $400 and $1,200.
- Heads: Upgraded cylinder heads can range from $2,000 to $4,000.
- Fuel System: A high-flow fuel system may cost around $600 to $1,800.
- Exhaust: Performance headers and exhaust can range from $1,000 to $2,500.
Comparative Analysis of Build Costs
When comparing the costs of building LS and HEMI engines for 650+ horsepower, several factors come into play. Below is a summary of the potential costs associated with each engine:
- Total LS Build Cost: Approximately $8,000 to $15,000.
- Total HEMI Build Cost: Approximately $10,000 to $18,000.
Parts Availability and Choices
Both LS and HEMI engines have a wide range of aftermarket support, but there are some differences in parts availability:
- LS Engines: The LS platform benefits from a vast aftermarket, making parts relatively easy to find and often more affordable.
- HEMI Engines: While the HEMI has a growing aftermarket, some specialized parts may be more expensive and less readily available.
Conclusion
Both LS and HEMI engines can be built to achieve 650+ horsepower, but the path taken can differ significantly in terms of costs and parts choices. The LS engine generally offers a more economical route due to its extensive aftermarket support, while the HEMI provides unique performance characteristics that some builders may prefer. Ultimately, the choice between LS and HEMI will depend on individual preferences, budget, and desired performance outcomes.