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The Mopar 440 engine is a legendary powerplant that has earned its place in automotive history. Known for its robust performance and reliability, the 440 can be further enhanced with aftermarket cylinder heads. Upgrading to high-performance cylinder heads can yield significant horsepower gains, often exceeding 75 hp. This article delves into the various options available for Mopar 440 cylinder head upgrades, the benefits they provide, and key considerations for selecting the right heads for your build.
Understanding the Mopar 440 Engine
The Mopar 440 cubic inch engine, produced from 1966 to 1978, is part of the Chrysler B engine family. It was designed for power and torque, making it a popular choice for muscle cars and performance vehicles. The 440 features a cast iron block and is known for its durability and ability to handle modifications.
Key specifications of the Mopar 440 include:
- Displacement: 440 cubic inches
- Bore x Stroke: 4.32 in x 3.75 in
- Compression Ratio: Typically ranges from 8.7:1 to 10.5:1
- Stock Horsepower: Approximately 375 hp
Benefits of Upgrading Cylinder Heads
Upgrading the cylinder heads on your Mopar 440 can lead to several performance benefits, including:
- Increased Horsepower: Aftermarket heads can improve airflow, resulting in higher horsepower outputs.
- Better Torque: Enhanced combustion efficiency can lead to increased torque, improving acceleration.
- Improved Cooling: Many aftermarket heads offer better cooling capabilities, reducing the risk of overheating.
- Customization: Aftermarket options allow for specific tuning to match your performance goals.
Types of Aftermarket Cylinder Heads
There are several types of aftermarket cylinder heads available for the Mopar 440, each offering unique features and benefits:
- Aluminum Heads: Lighter than cast iron, aluminum heads offer excellent thermal conductivity and can improve performance.
- Ported Heads: These heads have been modified to enhance airflow, providing significant horsepower gains.
- High-Compression Heads: Designed for higher compression ratios, these heads can maximize power output.
- Race Heads: Specifically engineered for racing applications, these heads prioritize performance over streetability.
Popular Aftermarket Cylinder Head Options
Several manufacturers offer high-quality aftermarket cylinder heads for the Mopar 440. Here are some of the most popular options:
- Edelbrock Performer RPM: Known for excellent performance and a good balance of street and race capabilities.
- Indy Cylinder Head: Offers a variety of heads designed for both street and race applications, with a focus on airflow.
- Stage V: Specializes in high-performance heads that can handle significant power increases.
- MP (Mopar Performance): Provides heads that are designed to work seamlessly with other Mopar components.
Installation Considerations
When upgrading to aftermarket cylinder heads, there are several installation considerations to keep in mind:
- Gasket Selection: Ensure you choose the correct gaskets to match your new heads and prevent leaks.
- Clearance Issues: Check for any potential clearance issues with the intake manifold, headers, or other components.
- Valve Train Compatibility: Confirm that your existing valve train components are compatible with the new heads.
- Tuning: After installation, consider tuning your engine to take full advantage of the new heads.
Performance Gains from Aftermarket Heads
Upgrading to aftermarket cylinder heads can yield impressive performance gains. Many enthusiasts have reported increases of 75 hp or more, depending on the specific heads chosen and the overall engine setup. The improvement in airflow and combustion efficiency allows for a more powerful engine that can perform exceptionally well on the street or track.
Conclusion
Upgrading the cylinder heads on your Mopar 440 is one of the most effective ways to boost performance. With various aftermarket options available, you can achieve substantial horsepower gains and enhance the overall driving experience. Whether you’re building a street machine or a race-ready engine, investing in quality cylinder heads will pay dividends in performance and enjoyment.