Building a 6.4 Hemi for 600+ Hp: Cam, Pistons, and Forced Induction Options

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The 6.4 HEMI engine, known for its robust performance and impressive power potential, is a popular choice among automotive enthusiasts looking to build a high-performance machine. Achieving over 600 horsepower from this engine requires thoughtful selection of components, particularly in the areas of camshaft, pistons, and forced induction. In this article, we will explore the best options available for each of these components to help you build a powerful 6.4 HEMI.

Understanding the 6.4 HEMI Engine

The 6.4 HEMI, also known as the 392 HEMI, is a 6.4-liter V8 engine that delivers a solid foundation for performance builds. It features a unique hemispherical combustion chamber design that promotes efficient airflow and combustion. With a factory output of around 485 horsepower and 475 lb-ft of torque, the 6.4 HEMI is already a strong performer, but with the right modifications, it can easily exceed the 600 horsepower mark.

Choosing the Right Camshaft

The camshaft is one of the most critical components in achieving higher horsepower. The right cam can enhance airflow, improve throttle response, and increase overall power output. When selecting a camshaft for your 6.4 HEMI, consider the following:

  • Duration: Longer duration can improve high-end power but may sacrifice low-end torque.
  • Lift: Higher lift increases airflow, which can lead to more power.
  • Overlap: More overlap can improve performance at higher RPMs but may affect idle quality.

Here are some popular camshaft options for the 6.4 HEMI that can help you reach your horsepower goals:

  • Comp Cams XFI Series: Known for excellent performance and reliability.
  • Mopar Performance Cam: A factory option that provides a great balance of performance and drivability.
  • Texas Speed Cam: Offers aggressive profiles for maximum power output.

Piston Selection for High Performance

Pistons play a crucial role in the engine’s compression ratio and overall performance. For a 600+ HP build, it’s essential to choose pistons that can handle increased power and boost levels. Consider the following factors when selecting pistons:

  • Material: Forged pistons are stronger and can withstand higher temperatures and pressures.
  • Compression Ratio: A higher compression ratio can improve power but may require higher octane fuel.
  • Design: Look for designs that promote better combustion and heat dissipation.

Top Piston Choices

Here are some recommended piston options for your 6.4 HEMI build:

  • Wiseco Forged Pistons: Known for their durability and performance in high horsepower applications.
  • Diamond Racing Pistons: Offers a variety of compression ratios and designs for custom builds.
  • CP-Carrillo Pistons: High-quality forged pistons designed for extreme performance.

Forced Induction Options

Adding forced induction is one of the most effective ways to increase horsepower significantly. Both superchargers and turbochargers can provide the necessary boost to help your 6.4 HEMI exceed 600 HP. Here are some considerations:

  • Superchargers: Provide immediate power and throttle response, ideal for street applications.
  • Turbochargers: Offer higher power potential and efficiency, especially at higher RPMs.
  • Intercoolers: Essential for reducing intake temperatures and maximizing performance.

Here are some of the leading forced induction kits for the 6.4 HEMI:

  • Whipple Supercharger: Known for its reliability and performance gains.
  • Procharger Supercharger: Offers a significant boost with minimal lag.
  • Turbonetics Turbo Kit: Provides excellent power potential with proper tuning.

Tuning and Supporting Mods

After upgrading the camshaft, pistons, and adding forced induction, tuning becomes critical. Proper tuning ensures that the engine runs efficiently and reliably. Additionally, consider supporting modifications such as:

  • Fuel System Upgrades: Ensure your fuel system can supply the necessary fuel for increased power.
  • Exhaust System: An aftermarket exhaust can improve airflow and performance.
  • Cooling System: Upgrading the cooling system helps manage the increased heat from higher performance.

Conclusion

Building a 6.4 HEMI for 600+ horsepower is an exciting project that requires careful consideration of components like camshaft, pistons, and forced induction. By selecting the right parts and ensuring proper tuning, you can unleash the full potential of your 6.4 HEMI engine, creating a powerful machine that delivers thrilling performance on the road or track.