The Chevrolet small-block 350 is a legendary engine, known for its reliability, power potential, and ease of modification. Upgrading to aluminum heads is a popular choice for enthusiasts seeking improved performance, and this guide explores everything you need to know about choosing the right set for your project. We'll cover various aspects, from the benefits of aluminum to specific head considerations and frequently asked questions.
Why Choose Aluminum Heads for a 350 Small Block?
Aluminum cylinder heads offer several key advantages over their cast iron counterparts:
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Reduced Weight: Aluminum is significantly lighter than cast iron, reducing rotating mass and improving engine responsiveness. This translates to quicker acceleration and better handling, particularly noticeable in performance applications.
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Improved Heat Dissipation: Aluminum's superior heat transfer properties allow for better heat dissipation, keeping the engine cooler under high loads. This can prevent detonation and allow for higher compression ratios, leading to increased power.
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Increased Flow Capacity: Many aftermarket aluminum heads feature improved port designs, offering increased airflow compared to stock cast iron heads. This enhances combustion efficiency and contributes to significant power gains.
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Enhanced Durability (with proper maintenance): While some may perceive aluminum as less durable, modern aluminum heads are engineered to withstand the stresses of high-performance applications. Proper maintenance, including regular inspection and proper lubrication, is key.
What to Consider When Choosing 350 Small Block Aluminum Heads?
Selecting the right aluminum heads depends on your specific goals and budget. Key factors to consider include:
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Compression Ratio: The chosen heads will influence your engine's compression ratio. Higher compression ratios generally lead to more power but require higher-octane fuel. Carefully consider your fuel and engine build.
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Chamber Design: Different chamber designs (e.g., open, closed, quench) impact combustion efficiency. Research the characteristics of various chamber designs to find the best fit for your application.
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Port Volume and Design: Larger port volumes generally favor higher RPM power, while smaller ports can provide better low-end torque. Consider your engine's intended use (street, drag racing, etc.) when making this selection.
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Valve Size and Material: Larger valves typically allow for greater airflow, but may require additional modifications. Valve material (e.g., stainless steel, titanium) affects durability and weight.
What are the Different Types of 350 Small Block Aluminum Heads?
The market offers a wide range of aluminum heads, from budget-friendly options to high-performance units designed for extreme applications. Research different brands and their offerings to find the best fit for your needs. Consider factors like the intended use, budget, and desired level of performance.
How Much Power Can I Expect to Gain with Aluminum Heads?
The power gains from upgrading to aluminum heads vary greatly depending on the specific heads, the rest of your engine build, and your tuning. You can reasonably expect significant horsepower and torque increases, often in the range of 20-50 horsepower or more, depending on your existing setup and the quality of the heads.
Are Aluminum Heads More Expensive Than Cast Iron Heads?
Yes, generally aluminum heads are significantly more expensive than cast iron heads due to the manufacturing process and materials used. However, the performance gains often justify the cost for many enthusiasts.
Do Aluminum Heads Require Special Maintenance?
While aluminum heads are durable, they require proper maintenance to ensure their longevity. Regular inspections, proper coolant levels, and appropriate lubrication are crucial to prevent issues. Consult your head manufacturer's instructions for detailed maintenance recommendations.
Conclusion
Upgrading your 350 small block with aluminum heads can significantly enhance performance and provide a substantial power increase. Carefully consider your budget, performance goals, and the various factors discussed above to select the optimal heads for your project. Remember to consult with experienced engine builders or professionals for assistance in selecting and installing the heads correctly.
