Ls vs Hemi Comparison: Achieving 800+ Hp with Forged Internals and Performance Camshafts

by

The debate between LS and HEMI engines has been a hot topic among automotive enthusiasts for years. Both engine families have their strengths and weaknesses, particularly when it comes to achieving high horsepower figures. In this article, we will explore how both LS and HEMI engines can be modified to exceed 800 horsepower using forged internals and performance camshafts.

Understanding LS and HEMI Engines

The LS engine, developed by General Motors, is known for its lightweight design and high-revving capabilities. Conversely, the HEMI engine, produced by Chrysler, is recognized for its robust construction and torque characteristics. Both engines have a loyal following, but their design philosophies differ significantly.

LS Engine Overview

LS engines, part of the GM Gen III and IV family, are popular for their versatility and performance potential. Key features include:

  • Aluminum block for reduced weight
  • Modular design allows for easy upgrades
  • High-flow cylinder heads
  • Advanced fuel injection systems

HEMI Engine Overview

HEMI engines, characterized by their hemispherical combustion chambers, offer a unique advantage in terms of airflow and power. Important aspects include:

  • Robust iron or aluminum block options
  • High torque output at low RPMs
  • Iconic design with a distinctive look
  • Strong aftermarket support for modifications

Achieving 800+ Horsepower

Both LS and HEMI engines can be built to exceed 800 horsepower, but the approach and components used can vary. Here’s how to achieve this power level with both engine types.

Forged Internals

One of the first steps in building an engine for high horsepower is upgrading to forged internals. This includes:

  • Forged pistons for higher compression ratios
  • Forged connecting rods for increased strength
  • Forged crankshafts to withstand higher RPMs and loads

Performance Camshafts

Upgrading the camshaft is crucial for maximizing airflow and performance. Consider the following:

  • Choose a camshaft with a higher lift and duration
  • Consider a cam profile that matches your powerband
  • Ensure compatibility with your engine’s valvetrain components

LS vs HEMI: Performance Comparison

When comparing the performance of LS and HEMI engines, several factors come into play. Here’s a breakdown of their performance characteristics:

  • Weight: LS engines are generally lighter, aiding in overall vehicle performance.
  • Torque: HEMI engines typically produce more torque at lower RPMs.
  • Aftermarket Support: Both engines have extensive aftermarket support, but LS parts are often more readily available.
  • Tuning: LS engines benefit from a more established tuning community, providing more options for performance enhancements.

Cost Considerations

Building an engine to achieve 800+ horsepower can be costly. Here are some factors to consider:

  • Cost of forged internals can range from $1,500 to $3,500.
  • Performance camshafts can cost between $500 and $1,500.
  • Labor costs for installation and tuning should also be factored in.
  • Additional costs for supporting modifications like fuel systems and exhaust upgrades.

Conclusion

Both LS and HEMI engines have the potential to achieve over 800 horsepower with the right modifications. By focusing on forged internals and performance camshafts, enthusiasts can unlock the full potential of these legendary engines. Ultimately, the choice between LS and HEMI will depend on personal preference, intended use, and budget.