The legendary small-block Chevy 350 is a cornerstone of American automotive history, and choosing the right cylinder heads is crucial for performance. This guide dives deep into the best and worst 350 Chevy heads, considering various factors like flow characteristics, design features, and overall performance potential. We'll help you navigate the options to ensure you make the best choice for your build.
Understanding Cylinder Head Significance
Before we delve into specific head models, let's understand why choosing the right cylinder heads is so vital. Cylinder heads are the gateway for air and fuel into the combustion chamber, and their design directly impacts engine performance. Key factors influenced by head selection include:
- Flow: The volume of air and fuel a head can pass through at different lift points. Higher flow generally means more power.
- Combustion Chamber Design: The shape and size of the combustion chamber significantly influence how efficiently fuel burns.
- Valve Size and Location: Larger valves and optimal valve placement maximize airflow.
- Porting and Machining: Modifications to the intake and exhaust ports can significantly improve flow.
Best 350 Chevy Heads: Top Performers
Several cylinder heads stand out for their performance and popularity amongst 350 Chevy enthusiasts. These are generally considered the "best" based on a combination of flow, design, and aftermarket support:
1. Edelbrock Performer RPM:
These heads are a great all-around choice, offering a good balance of street and performance characteristics. They feature excellent flow numbers, making them ideal for naturally aspirated builds and mild modifications. Their design and extensive aftermarket support make them easy to work with and upgrade.
2. AFR (Air Flow Research) 185cc Heads:
AFR heads are renowned for their high flow characteristics and exceptional quality. They are a popular choice for high-performance builds, delivering significant power gains. However, they are typically more expensive than other options.
3. Dart Pro 1 Heads:
These heads are built for serious performance and excel in high-RPM applications. They offer exceptional flow at high lift and are a preferred option for racing and high-performance street builds. However, their high cost and specific tuning requirements make them less suitable for beginners.
Worst 350 Chevy Heads: What to Avoid
While many heads offer decent performance, some are less desirable due to inherent design limitations or poor flow characteristics. It's crucial to avoid these if possible:
1. Original Equipment Manufacturer (OEM) Heads (Casting Numbers Vary):
While functional, stock heads from the factory usually restrict airflow compared to aftermarket options. This translates to less power potential, especially when modifications are made. If you're aiming for significant power gains, replacing these is highly recommended.
2. Heads with Excessive Wear or Damage:
Damaged or severely worn cylinder heads will significantly reduce performance and even cause engine failure. Always thoroughly inspect used heads for cracks, warping, or other damage before installation.
Choosing the Right Heads for Your Build
The "best" 350 Chevy head ultimately depends on your specific goals and budget. Consider the following factors when making your decision:
- Budget: Aftermarket heads range in price significantly.
- Engine Modifications: The level of modification to your engine will heavily influence your head selection.
- Intended Use: Street use, racing, or off-road driving each demands specific head characteristics.
- Experience Level: Some high-performance heads require advanced tuning expertise.
Selecting the right cylinder heads is a critical step in building a powerful and reliable 350 Chevy engine. By understanding the strengths and weaknesses of different head options, you can make an informed decision that aligns with your project goals and budget. Remember to always research specific casting numbers and consult expert opinions before committing to a purchase.
