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The AMC AMX is a classic muscle car that has captured the hearts of enthusiasts for decades. With its unique styling and powerful engine options, the AMX has become a popular choice for performance modifications. In this article, we will explore how to achieve over 400 horsepower through camshaft and head work modifications.
Understanding the AMC AMX Engine
The AMC AMX was equipped with several engine options, most notably the 390 and 401 cubic inch V8s. These engines are known for their robust design and potential for high performance. To achieve significant horsepower gains, it is crucial to understand the engine’s components and how they work together.
Key Performance Modifications
To reach the 400+ horsepower mark, specific modifications to the camshaft and cylinder heads are essential. These components play a pivotal role in the engine’s airflow and overall performance.
Camshaft Upgrades
A performance camshaft is one of the most effective ways to increase horsepower. The right camshaft will improve lift and duration, allowing for better airflow into and out of the engine. When selecting a camshaft for the AMC AMX, consider the following:
- Choose a camshaft with higher lift and longer duration.
- Consider a roller camshaft for improved performance and efficiency.
- Match the camshaft to your specific engine setup and intended use.
Cylinder Head Modifications
Upgrading the cylinder heads is another critical step in achieving higher horsepower. The stock heads can be restrictive, limiting airflow. Here are some modifications to consider:
- Porting and polishing the heads to improve airflow.
- Installing larger valves to increase intake and exhaust flow.
- Using aftermarket performance heads designed for higher horsepower applications.
Supporting Modifications
In addition to camshaft and head work, several supporting modifications can help you achieve and maintain over 400 horsepower. These include:
- Upgrading the intake manifold for better airflow.
- Installing a high-performance carburetor or fuel injection system.
- Adding headers and a high-flow exhaust system to improve exhaust flow.
- Using a performance ignition system for more reliable spark.
Tuning for Maximum Performance
Once the modifications are complete, proper tuning is essential to unlock the full potential of your AMC AMX. Consider the following tuning aspects:
- Dyno tuning to optimize fuel and ignition settings.
- Adjusting the air-fuel mixture for peak performance.
- Ensuring the timing is set correctly for the new camshaft.
Conclusion
Achieving 400+ horsepower in an AMC AMX is possible with the right combination of camshaft and head work, along with supporting modifications and proper tuning. By understanding the engine’s needs and making strategic upgrades, enthusiasts can enjoy the thrill of driving a powerful and iconic muscle car.