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The Pontiac 455 engine, known for its robust performance and torque, can be significantly enhanced with the right head upgrades. By focusing on increasing airflow and optimizing combustion efficiency, enthusiasts can unlock an additional 100+ horsepower. This article will explore various head upgrades, their benefits, and how they can transform your Pontiac 455 into a powerhouse.
Understanding the Pontiac 455 Engine
The Pontiac 455 was produced from 1970 to 1976 and is part of the Pontiac V8 family. It features a large displacement that allows for substantial torque and power output. However, like many stock engines, it has limitations in airflow and efficiency that can be improved with aftermarket head modifications.
Benefits of Upgrading Pontiac 455 Heads
Upgrading the heads on a Pontiac 455 can lead to numerous benefits, including:
- Increased Airflow: Better head designs allow for more air entering and exiting the combustion chamber.
- Improved Combustion Efficiency: Enhanced fuel-air mixing leads to more complete combustion.
- Higher Horsepower: Increased airflow and efficiency can result in significant horsepower gains.
- Better Torque Delivery: Optimized heads can improve low-end and mid-range torque.
Types of Head Upgrades
There are several types of head upgrades available for the Pontiac 455, each offering unique advantages. Below are some of the most popular options:
- Aluminum Cylinder Heads: Lighter than cast iron, aluminum heads dissipate heat better and can be designed for higher performance.
- Porting and Polishing: This process enhances airflow by smoothing out the intake and exhaust ports.
- High-Performance Valves: Upgrading to larger valves can improve airflow and combustion efficiency.
- Aftermarket Head Kits: Complete kits often include all necessary components for a significant upgrade.
Choosing the Right Heads for Your Pontiac 455
When selecting heads for your Pontiac 455, consider the following factors:
- Intended Use: Determine whether your vehicle will be used for daily driving, racing, or show purposes.
- Compression Ratio: Ensure that the heads you choose will work with your current or planned compression ratio.
- Budget: Set a budget that includes not just the heads but also supporting modifications.
- Compatibility: Ensure the heads are compatible with your existing engine components.
Popular Pontiac 455 Head Options
Several aftermarket manufacturers produce high-quality heads for the Pontiac 455. Some of the most popular options include:
- Edelbrock Performer RPM Heads: Known for excellent airflow and performance, these aluminum heads are a favorite among enthusiasts.
- KRE (Kauffman Racing Equipment) Aluminum Heads: These heads are designed for maximum performance and feature larger ports and valves.
- Summit Racing Aluminum Heads: Offering a balance of performance and affordability, these heads are a great option for budget-conscious builders.
- Stock Replacement Heads: For those looking to maintain a classic feel, high-quality stock replacements are available.
Installation and Tuning Considerations
After selecting the right heads, proper installation and tuning are crucial for maximizing performance:
- Professional Installation: Consider hiring a professional if you are not experienced in engine work.
- Proper Gasket Selection: Use high-quality gaskets to prevent leaks and ensure a good seal.
- Tuning: After installation, tuning the engine is essential to fully realize the potential of the upgraded heads.
- Supporting Mods: Consider additional upgrades like headers, camshafts, and exhaust systems to complement your new heads.
Conclusion
Upgrading the heads on your Pontiac 455 is a sure way to increase airflow and power, potentially adding over 100 horsepower. By selecting the right components and ensuring proper installation, you can transform your engine into a formidable performer. Whether you’re a casual enthusiast or a serious racer, these upgrades can provide the performance boost you seek.