Power Gains from Mopar Performance E67 340 Heads on a 1970 Challenger — Boosting Hp by 25%

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The 1970 Challenger is an iconic muscle car known for its performance and style. One of the key components influencing its power output is the cylinder head. The Mopar Performance E67 340 heads are a popular upgrade that can significantly boost horsepower. In this article, we will explore the power gains achieved by installing these heads on a 1970 Challenger, leading to an impressive increase of up to 25% in horsepower.

Understanding the E67 340 Heads

The E67 340 heads are designed specifically for the 340 cubic inch V8 engine found in various Mopar vehicles. These heads feature several enhancements over the stock heads, including:

  • Improved airflow: The E67 heads have larger intake and exhaust ports, allowing for better airflow and combustion efficiency.
  • Higher compression ratio: These heads typically support a higher compression ratio, which can lead to increased power output.
  • Better valve sizes: The larger valves in the E67 heads enhance the engine’s ability to breathe, contributing to improved performance.

Installation Process

Installing Mopar Performance E67 340 heads on a 1970 Challenger involves several steps that require mechanical knowledge and the right tools. Here’s a brief overview of the installation process:

  • Preparation: Ensure the engine is cool and disconnect the battery. Remove any components obstructing access to the cylinder heads.
  • Removing old heads: Unbolt the existing cylinder heads and carefully lift them off the engine block.
  • Cleaning surfaces: Clean the engine block and ensure that the surface is free of debris and old gasket material.
  • Installing new heads: Place the new E67 heads onto the engine block, aligning them properly with the bolt holes.
  • Torque specifications: Follow the manufacturer’s torque specifications when tightening the head bolts to ensure a proper seal.
  • Reassembly: Reinstall any components that were removed and reconnect the battery.

Performance Gains

After installing the Mopar Performance E67 340 heads, many owners report significant power gains. Here are some key performance metrics:

  • Horsepower increase: Users have documented increases of up to 25 horsepower compared to stock heads.
  • Torque improvements: Enhanced torque delivery throughout the power band, making the vehicle more responsive.
  • Better throttle response: The improved airflow allows for quicker acceleration and better overall performance.

Real-World Testing

To validate the performance gains from the E67 340 heads, real-world testing is essential. Many enthusiasts have taken their modified Challengers to the dyno for accurate horsepower readings. Here’s what some have found:

  • Baseline measurements: Stock 340 engines typically produce around 240-250 horsepower at the crank.
  • Post-installation results: After installing the E67 heads, dyno tests have shown figures reaching 275-300 horsepower.
  • Comparative analysis: These gains can place the Challenger in a competitive position against modern muscle cars.

Conclusion

Upgrading to Mopar Performance E67 340 heads on a 1970 Challenger is a proven method to boost horsepower significantly. With a potential increase of 25% in power, this modification not only enhances performance but also elevates the driving experience. Whether for street use or track performance, the E67 heads are a worthwhile investment for any Challenger enthusiast.