Chevy Square Body Head Upgrades: How $1,000 Can Add 30 Hp with Aftermarket Heads

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The Chevy Square Body trucks, produced between 1973 and 1987, are iconic in the world of American automotive history. Known for their rugged design and versatility, these trucks have become popular among enthusiasts and restorers alike. One of the most effective ways to enhance the performance of a Chevy Square Body is through head upgrades. With a budget of around $1,000, you can add significant horsepower to your vehicle by investing in aftermarket heads.

Understanding Aftermarket Heads

Aftermarket heads are designed to improve airflow, increase compression, and enhance overall engine performance. By replacing the factory heads with high-performance options, you can unlock additional horsepower and torque. Here, we will explore the benefits of upgrading to aftermarket heads and how they contribute to your Chevy Square Body’s performance.

  • Improved airflow for better combustion
  • Increased compression ratios
  • Enhanced cooling efficiency
  • Compatibility with performance camshafts

Choosing the Right Aftermarket Heads

When selecting aftermarket heads for your Chevy Square Body, it’s essential to consider several factors to ensure compatibility and performance gains. Here are some key aspects to keep in mind:

  • Material: Most aftermarket heads are made from aluminum or cast iron. Aluminum heads are lighter and dissipate heat better, while cast iron heads are more durable.
  • Port Size: The port size affects airflow. Larger ports can increase horsepower but may sacrifice low-end torque.
  • Valves: Upgrading to larger valves can improve airflow and combustion efficiency.
  • Compression Ratio: Ensure the heads you choose will work with your current engine setup to achieve the desired compression ratio.

There are several aftermarket head options available for Chevy Square Body trucks. Here are a few popular choices that can help you achieve that extra 30 horsepower:

  • Edelbrock Performer RPM Heads: Known for their excellent performance and quality, these heads provide a great balance of power and drivability.
  • Summit Racing Aluminum Heads: These budget-friendly heads offer significant performance improvements and are a popular choice among enthusiasts.
  • Trick Flow Heads: Designed for high-performance applications, Trick Flow heads are known for their superior airflow and power gains.
  • World Products Heads: Offering a variety of options, World Products heads are designed for both street and race applications.

Installation Process

Installing aftermarket heads on your Chevy Square Body can be a rewarding project, but it requires careful planning and execution. Here’s a step-by-step overview of the installation process:

  • Gather Tools and Materials: Ensure you have all necessary tools, including wrenches, sockets, a torque wrench, and gaskets.
  • Remove Old Heads: Disconnect the battery, remove the intake manifold, and detach any components obstructing access to the cylinder heads.
  • Clean the Engine Block: Thoroughly clean the surface of the engine block to ensure a proper seal for the new heads.
  • Install New Heads: Place the new heads onto the engine block, ensuring proper alignment with the dowel pins.
  • Tighten Head Bolts: Follow the manufacturer’s torque specifications to tighten the head bolts in the correct sequence.
  • Reassemble Engine Components: Reattach the intake manifold, exhaust headers, and any other components removed during the process.

Tuning Your Engine

After installing aftermarket heads, tuning your engine is crucial to maximizing performance gains. Consider the following:

  • ECU Reprogramming: If your vehicle has an electronic control unit (ECU), reprogramming it can optimize fuel delivery and timing.
  • Dyno Testing: A dyno test can help you measure the horsepower and torque gains achieved with the new heads.
  • Carburetor Adjustments: Ensure your carburetor is adjusted to accommodate the increased airflow from the new heads.

Conclusion

Upgrading to aftermarket heads is one of the most effective ways to enhance the performance of your Chevy Square Body truck. With a budget of around $1,000, you can achieve significant horsepower gains, making your vehicle more enjoyable to drive. By choosing the right heads, ensuring proper installation, and tuning your engine, you can unlock the full potential of your classic truck.