New Pair Chevrolet GM Duramax 6.6 Diesel Cylinder Heads LB7 2001-2004.5

Upgrade your engine with 2 new GM Chevrolet Duramax 6.6 LB7 diesel aftermarket cylinder heads, compatible with 2001-2004.5 models. Each head comes with injector sleeves installed. Confirm LB7 compatibility by checking the 8th digit of your VIN; it must be “1”.

Key Features Duramax 6.6 LB7 Cylinder Head:

• Compatibility: Specifically designed for GM Chevrolet Duramax 6.6 LB7 diesel engines (2001-2004.5).
• Injector Sleeves: Pre-installed for convenience and optimal performance.
• Quality Assurance: Each head is thoroughly cleaned, inspected, and pressure-tested to ensure reliability and longevity.
• Precision Machining: All seat and guide work is performed on the latest state-of-the-art Serdi or Sunnen equipment. Heads are resurfaced using a Rottler CBN machine for the required RMA finish.
• Sealing: Quality valve seals are installed, and a vacuum is pulled on each valve to ensure a perfect seal between the valve and seat.
• Core Return Required

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!

Why Choose Our Cylinder Heads?

A cylinder head is crucial for the efficiency and performance of your engine. It contains the intake and exhaust valves, spark plugs, and fuel injectors, which are vital for the engine’s operation. Our heads are designed to handle the extreme pressures and temperatures within the combustion chamber, ensuring optimal engine performance.

Signs You May Need a New Cylinder Head:

1. Weak Engine: Poor fuel efficiency, sluggish acceleration, or difficulty climbing steep inclines may indicate a cracked cylinder head.
2. Oil Leakage: Puddles of oil under your vehicle can signal a leaking cylinder head.
3. Coolant Leakage: Overheating warnings or coolant puddles may indicate a cracked head.
4. Engine Misfires: Repeated engine failures or trouble starting may be due to cylinder head damage.
5. Smoke: White smoke from the engine suggests severe cylinder head failure.

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