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The Pontiac 455 is a legendary engine known for its power and performance. However, to truly unlock its potential, upgrading the cylinder heads is crucial. In this article, we will explore the best cylinder head upgrades for the Pontiac 455, focusing on options that can provide significant horsepower boosts, including the impressive AFR 285 heads.
Understanding Cylinder Head Upgrades
Cylinder heads play a vital role in the performance of an engine. They are responsible for the intake and exhaust flow, which directly impacts horsepower and torque. Upgrading to better cylinder heads can improve airflow, combustion efficiency, and overall engine performance.
Stock Pontiac 455 Cylinder Heads
The stock cylinder heads on a Pontiac 455 are decent but can limit the engine’s performance. Typically, these heads have smaller ports and valves, which restrict airflow. While they can support mild performance upgrades, they often fall short for those seeking significant horsepower gains.
Performance Limitations
With stock heads, you might expect a maximum output of around 300-350 horsepower. This is fine for cruising, but if you’re looking to push the limits, it’s time to consider aftermarket options.
Aftermarket Cylinder Head Options
There are several aftermarket cylinder head options available for the Pontiac 455. Each offers varying levels of performance enhancements, so it’s essential to choose one that aligns with your goals.
- Edelbrock Performer RPM Heads: These heads provide excellent airflow and are ideal for street performance.
- Summit Racing Aluminum Heads: A budget-friendly option that significantly improves performance over stock heads.
- Trick Flow Heads: Designed for high-performance applications, offering increased flow and power.
- AFR 285 Heads: The ultimate upgrade for serious horsepower enthusiasts, offering a substantial boost.
AFR 285 Heads: A Game Changer
The AFR 285 heads are among the best options available for the Pontiac 455. Designed for maximum performance, these heads can provide a staggering 70 horsepower increase over stock heads.
Features of AFR 285 Heads
- Large Intake and Exhaust Ports: Enhanced airflow for better combustion.
- High-Quality Aluminum Construction: Lightweight and durable, improving overall engine efficiency.
- Improved Valve Sizes: Larger valves allow for increased airflow and power.
- Excellent Machining: Precision-engineered for optimal performance and fit.
Performance Gains
When properly installed, the AFR 285 heads can push the Pontiac 455 to over 400 horsepower, depending on other supporting modifications. This makes them a top choice for enthusiasts looking to maximize their engine’s potential.
Installation Considerations
Installing new cylinder heads can be a complex task, requiring attention to detail. Here are some considerations to keep in mind:
- Gasket Selection: Choose high-quality gaskets to prevent leaks.
- Torque Specifications: Follow manufacturer guidelines for proper torque settings.
- Clearance Checks: Ensure there is adequate clearance for larger valves and ports.
- Supporting Modifications: Consider upgrading the intake, carburetor, and exhaust for optimal performance.
Conclusion
Upgrading the cylinder heads on your Pontiac 455 can lead to significant performance improvements. From stock to aftermarket options like the AFR 285 heads, there are choices to fit every enthusiast’s needs. With the right upgrades, you can unlock the true potential of your Pontiac 455 and enjoy an exhilarating driving experience.