New Pair Loaded Duramax 6.6L GM Chevrolet Silverado Sierra Cylinder Heads LLY

Enhance the performance and reliability of your GM Duramax 6.6L engine with our brand-new pair of loaded 6.6 Duramax 6.6L LLY cylinder heads, designed specifically for the Silverado and Sierra models. These heavy-duty aftermarket cylinder heads are engineered to meet or exceed OEM specifications, ensuring superior durability and performance, even under the most demanding conditions. Loaded with valves, springs, and retainers, these cylinder heads are ready for seamless installation and built to deliver long-lasting reliability.

Key Features:

• Durable Aftermarket Casting: Our LLY cylinder heads are manufactured with a robust aftermarket casting, providing greater strength and resistance to cracking compared to the factory heads. The thicker casting design is built to withstand high pressure and temperatures, making it ideal for heavy-duty use.
• Loaded with High-Quality Components: These cylinder heads come fully assembled with valves, springs, and retainers. This setup optimizes airflow and combustion, enhancing overall engine efficiency and power output.
• Precision Engineering: Designed to meet exact specifications, our LLY cylinder heads ensure a perfect fit and reliable performance in GM Duramax 6.6L engines. The precision-machined valve seats and guides offer enhanced durability and optimal sealing, preventing leaks and extending the lifespan of your engine components.
• Application Fit: Specifically designed for GM Silverado and Sierra trucks with the 6.6L Duramax LLY engine, providing a perfect fit and easy installation.
• Core Return Required

Benefits:

• Superior Performance: The thick casting and premium components improve engine performance by promoting better sealing, heat dissipation, and airflow. This results in increased power, fuel efficiency, and reduced emissions.
• Long-Lasting Durability: With reinforced casting and high-strength materials, these cylinder heads are built to last, reducing the need for frequent replacements and repairs.
• Ready for Installation: Our cylinder heads come loaded and assembled, making the installation process quick and efficient. Designed for an exact fit, no modifications are required, allowing you to get your vehicle back on the road with minimal downtime.

Why Choose Our Duramax 6.6L Cylinder Heads?

Choosing our heavy-duty aftermarket LLY cylinder heads means investing in quality, durability, and performance. Engineered to address common issues with factory heads, such as cracking under pressure, these heads are the perfect upgrade for your Silverado or Sierra. Backed by our commitment to providing premium products, these cylinder heads will keep your engine running smoothly for years to come.

Heavy Duty Parts Company – Core Returns Policy

At Heavy Duty Parts Company, core returns are essential to our ability to provide high-quality, cost-effective cylinder heads to our customers. These returned cores supply essential components, such as keepers, springs, and retainers, which are critical to engine performance.

No Core Charge – Just Send It Back!

Unlike other companies, we do not charge a core fee upfront. Instead, we rely on our customers to return their used cores to keep our supply chain running smoothly.

Why Core Returns Matter

• Many small but essential parts from cores are reused to maintain OEM-quality cylinder heads.
• Returning cores keeps prices competitive by reducing the need for costly new components.
• It supports sustainability by minimizing waste and conserving resources.

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!

Shipping Information

We ship exclusively to the lower 48 states. Insurance, packaging, and handling are included in the shipping cost to ensure safe and secure delivery.

Warranty Information

Our cylinder heads are backed by a two-year unlimited mileage parts warranty. The warranty covers parts only and does not include labor or incidental costs. To maintain warranty coverage, the heat tab must remain intact and unaltered.

Contact Us

For more information or assistance, visit our website and explore our extensive selection of high-quality cylinder heads and engine components at Heavy Duty Parts Company.

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Duramax 6.6 LLY