3.8L GM Cast Iron Supercharged Cylinder Heads

Product Description:

Unlock the full potential of your GM engine with 3.8L GM Supercharged Heads. These performance-enhancing cylinder heads are designed to optimize airflow, boost engine power, and provide long-lasting durability for high-performance builds. Whether you’re upgrading or replacing the heads on your GM 3800 engine, these 3.8L GM Supercharged Heads are the ideal solution for better engine efficiency. A core return is required for this purchase.

Key Features of 3.8L GM Supercharged Heads

• Precision Engineering: Crafted for performance and reliability in high-boost applications.
• Cast Iron Construction: Built to handle extreme heat and pressure, ensuring durability.
• Enhanced Airflow: Improves intake and exhaust flow for better engine power.
• Perfect Fit for GM Engines: Designed specifically for GM vehicles with 3.8L supercharged engines.

Performance Benefits of 3.8L GM Supercharged Heads

• More Power: Increases horsepower and torque for better performance.
• Better Throttle Response: Achieves quicker acceleration and smoother engine operation.
• Enhanced Durability: Withstands high-boost applications and high temperatures.
• Longer Lifespan: Designed to last longer under extreme engine conditions.

Fitment Data

These cylinder heads fit the following GM vehicles:

• Pontiac Grand Prix (1996-2007)
• Pontiac Bonneville (1996-2003)
• Chevy Monte Carlo (2004)
• Chevy Impala (2004-2005)
• Buick Riviera (1996-1999)
• Buick Regal (1997-2004)
• Buick Park Avenue Ultra (1999-2000)
• Buick Park Avenue (1996-2003)

Heavy Duty Parts Company – Core Returns Policy

Effective December 17, 2025

At Heavy Duty Parts Company, core returns are essential to our ability to provide high-quality, cost-effective cylinder heads. Returned cores supply critical components—such as keepers, springs, and retainers—that are vital to proper engine performance and allow us to maintain OEM-level quality.

No Upfront Core Charge

Unlike many suppliers, we do not charge a core fee upfront. Instead, we rely on customers to return their used cores within the required timeframe.

Core Return Requirements

• Cores are due within 30 days of the purchase date

• If a core is not returned within 60 days, the product warranty is void

• Unreturned cores will be charged as follows:

  • Cylinder heads under $600: $200 per unreturned core

  • Cylinder heads $600 and above: $400 per unreturned core

Customers needing additional time may contact us to request an extension. Approved extensions will prevent core charges from being applied.

Core Return Process

Cylinder heads are shipped with prepaid core return labels included in packets attached to the outside of each box. If labels are missing, customers should contact us for replacements prior to returning the core.

Core Eligibility

Some cylinder heads do not require a core return. In certain cases, core requirements may be waived at our discretion.

Why Core Returns Matter

• Reused core components help maintain OEM-quality standards

• Core returns allow us to keep pricing competitive

• Recycling cores supports sustainability by reducing waste and conserving resources

This policy applies to all purchases made on or after December 17, 2025.

Send Back All Components

To ensure the quality and integrity of our remanufacturing process, we ask that you return all components that were originally included with your new cylinder head. This includes items such as:

• Rocker arms
• Camshafts (if applicable)
• Any other hardware that came with your purchase

Easy & Free Core Return Process

• Each purchase includes a prepaid core return label in a plastic sleeve on the box.
• Simply pack your core with all included components, attach the label, and drop it off with the carrier—no extra cost to you.
• Returned cores undergo inspection and recycling, ensuring maximum efficiency.

Customer Partnership & Sustainability

By returning your core and its components, you help maintain a reliable supply chain, ensuring we can continue offering top-quality products at the best prices. This process not only benefits your wallet but also contributes to a greener and more efficient automotive industry.

We appreciate your support in keeping our business and the industry running smoothly!

Why Choose 3.8L GM Supercharged Heads?

Designed for serious performance, these 3.8L GM Supercharged Heads enhance both the power and efficiency of your engine. Whether you are replacing old heads or upgrading to boost your performance, these heads are engineered for reliability and durability. Upgrade to the best for your GM engine and experience increased horsepower, better throttle response, and improved overall engine efficiency.

Shipping Information:
We ship to the lower 48 states only, with fast and reliable delivery to ensure your project stays on schedule.

Warranty Information:
The cylinder heads will come with a two year unlimited mileage warranty.

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