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The debate between LS and HEMI engines has been ongoing among automotive enthusiasts for years. Both engine platforms have their unique strengths, but when it comes to boosting power to 700+ horsepower, the right supporting modifications are crucial. In this article, we will explore the best supporting mods for LS and HEMI engines, focusing on AFR (Air-Fuel Ratio) adjustments and the importance of forged internals.
Understanding the Basics
Before diving into the specific modifications, it’s essential to understand the fundamental differences between LS and HEMI engines. The LS engine, known for its lightweight design and high-revving capabilities, often finds itself in the spotlight for performance builds. On the other hand, the HEMI engine, with its unique hemispherical combustion chamber design, offers excellent torque and power delivery.
Key Supporting Mods for LS Engines
1. Upgraded Cylinder Heads
One of the most significant upgrades for LS engines is the installation of upgraded cylinder heads. Aftermarket heads can greatly improve airflow, which is crucial for achieving higher horsepower. Brands like AFR offer heads designed specifically for high-performance applications.
2. Forged Internals
To handle the increased power, investing in forged internals is essential. Forged pistons and connecting rods provide the strength needed to withstand high horsepower and boost levels. This modification ensures reliability and longevity under extreme conditions.
3. High-Performance Camshaft
A high-performance camshaft can significantly enhance the engine’s power band. Choosing a camshaft with the right lift and duration will optimize airflow and improve overall performance, making it a vital mod for reaching that 700+ hp goal.
4. Upgraded Fuel System
As power increases, so does the need for fuel. An upgraded fuel system, including larger injectors and a high-flow fuel pump, is necessary to ensure the engine receives adequate fuel at higher power levels. This modification is crucial for maintaining a proper air-fuel ratio.
Key Supporting Mods for HEMI Engines
1. Performance Cylinder Heads
Similar to LS engines, HEMI engines benefit from performance cylinder heads. Upgrading to high-flow heads can enhance airflow and combustion efficiency, leading to increased horsepower and torque. Brands like Edelbrock offer excellent options for HEMI builds.
2. Forged Internals
HEMI engines also require forged internals when pushing for 700+ hp. Upgrading to forged pistons and rods is essential for reliability. This modification allows the engine to handle the increased stress and power without risking failure.
3. Performance Camshaft
A performance camshaft tailored for HEMI engines can provide significant power gains. Selecting a cam with the right specifications will improve airflow and enhance the engine’s overall performance, making it a key component in the build.
4. Upgraded Fuel System
Just like LS engines, HEMI engines require an upgraded fuel system to support higher horsepower levels. Larger fuel injectors and a high-performance fuel pump are essential to ensure proper fuel delivery, maintaining the optimal air-fuel ratio.
Importance of Air-Fuel Ratio (AFR)
Maintaining the correct air-fuel ratio is crucial for performance and engine longevity. An optimal AFR ensures efficient combustion, maximizing power output while minimizing the risk of engine damage. Both LS and HEMI builds should include wideband O2 sensors and tuning to achieve the desired AFR.
Conclusion
Boosting power to 700+ hp in LS and HEMI engines requires careful consideration of supporting modifications. Upgraded cylinder heads, forged internals, performance camshafts, and enhanced fuel systems are essential components of a successful build. By focusing on these key areas, enthusiasts can achieve impressive power levels while maintaining engine reliability.