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The Mopar 440 big block engine is a legendary powerplant known for its performance and potential. With the right modifications, it can be transformed from a stock engine into a high-performance beast capable of producing over 600 horsepower. This article will explore the costs associated with building a Mopar 440 big block engine, the modifications needed, and the real-world results that enthusiasts have experienced.
Understanding the Mopar 440 Big Block Engine
The Mopar 440 big block engine was introduced in 1966 and quickly gained a reputation for its power and torque. It was used in various Chrysler, Dodge, and Plymouth vehicles throughout the 1960s and early 1970s. The engine features a cast iron block, a 4.32-inch bore, and a 3.75-inch stroke, providing a displacement of 440 cubic inches.
Stock Performance Specifications
- Displacement: 440 cubic inches
- Horsepower: Approximately 375 hp
- Torque: Around 480 lb-ft
Building the 440 Big Block: Key Modifications
To achieve over 600 horsepower from a Mopar 440 big block, several modifications are necessary. These upgrades can vary in cost and complexity, but they are essential for maximizing performance.
1. Upgraded Cylinder Heads
Replacing the stock cylinder heads with high-performance aftermarket options can significantly improve airflow and combustion efficiency. Popular choices include:
- Edelbrock Performer RPM Heads
- Indy Cylinder Heads
2. High-Performance Camshaft
A performance camshaft is crucial for improving horsepower and torque. A cam with a higher lift and longer duration will allow for better airflow. Consider options like:
- Comp Cams Xtreme Energy Cam
- Lunati Voodoo Cam
3. Intake Manifold and Carburetor
An aftermarket intake manifold paired with a larger carburetor will enhance the engine’s ability to breathe. Recommended combinations include:
- Holley Super Victor Intake with a 850 CFM Carburetor
- Edelbrock Performer RPM Intake with a 750 CFM Carburetor
4. Exhaust System
A high-flow exhaust system is essential for reducing back pressure and improving performance. Options to consider are:
- Headers from Hooker or Hedman
- High-flow mufflers
5. Engine Compression
Increasing the engine’s compression ratio can lead to more power. This can be achieved by using flat-top pistons and milling the cylinder heads. Aim for a compression ratio of around 10.5:1 to 11.5:1 for optimal performance.
Estimated Costs of Building a 600+ HP Mopar 440
The costs associated with building a Mopar 440 big block engine can vary based on the parts chosen and whether you opt for professional installation or a DIY approach. Below is a breakdown of estimated costs:
- Cylinder Heads: $1,500 – $3,000
- Camshaft: $300 – $600
- Intake Manifold: $300 – $700
- Carburetor: $400 – $800
- Exhaust System: $500 – $1,200
- Pistons and Rings: $500 – $1,000
- Labor (if applicable): $1,000 – $2,000
Overall, the total cost for building a Mopar 440 big block engine to produce over 600 horsepower can range from $5,000 to $10,000, depending on the choices made.
Real-World Results: Performance Testing
Many enthusiasts have successfully built their Mopar 440 engines to exceed 600 horsepower. Here are a few examples of real-world results:
- A 440 big block with Edelbrock heads, a Comp Cams camshaft, and a Holley intake produced 620 hp on the dyno.
- Another build featuring Indy heads and a Lunati cam achieved 650 hp with a compression ratio of 11:1.
- A well-balanced setup with a high-flow exhaust system and custom tuning reached 675 hp.
Conclusion
Building a Mopar 440 big block engine to achieve over 600 horsepower is an exciting project for automotive enthusiasts. With the right modifications and careful planning, the potential for power is immense. The costs associated with these builds can vary, but the satisfaction and performance gains make it a worthwhile investment for those passionate about muscle cars.