2004.5-2005 LLY Stock New Duramax Heads - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
2004.5-2005 LLY Stock New Duramax Heads - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection
Industrial Injection LLY Duramax Stock Remanufactured Heads (2004.5-2005) - Industrial Injection

Industrial Injection 2004.5-2005 LLY Duramax Premium Stock Plus Cylinder Heads (RH & LH Set)

Industrial Injection SKU: PDM-LLYSH
Price
Regular price $1,74995
Regular price $000 Sale price $1,74995
Save $-1,749.95
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  • Free Ground shipping (Over $200*)
  • Top-of-the-line Customer Service
  • Secure payments
Shipping calculated at checkout.

2004.5-2005 LLY Duramax Premium Stock Plus Cylinder Heads (RH & LH Set)

Restore factory performance and long-term reliability to your 2004.5–2005 LLY Duramax 6.6L with these stock remanufactured cylinder heads. Built to OE specifications and professionally remanufactured, these heads are designed to provide dependable performance for stock rebuilds and mild performance applications.

Each cylinder head is thoroughly inspected, pressure tested, cleaned, and precision machined to ensure proper sealing, airflow, and durability. Whether you're replacing worn or damaged cylinder heads or refreshing your engine during a rebuild, these Premium Stock Plus heads offer a reliable solution built to last.

Key Features

  • Stock remanufactured LLY Duramax cylinder heads
  • Fully cleaned, pressure tested, and resurfaced
  • Diamond honed valve guides
  • Unshrouded valves for improved airflow
  • High-strength, heat-treated iron-based valve guides
  • Premium nickel-based, non-magnetic valve seat inserts
  • Multi-angle valve job
  • New valve springs installed
  • Assembled and ready for installation
  • Ideal for stock replacement or mild performance builds

Premium Stock Plus Remanufacturing Process

Every Premium Stock Plus cylinder head is professionally remanufactured using strict quality control standards. Each casting is thoroughly inspected, pressure tested, resurfaced, and machined to restore proper sealing and performance. Critical valvetrain components are renewed or upgraded as needed to ensure long service life and dependable operation.

The result is a cylinder head that delivers OE-style performance and reliability while incorporating premium machining processes designed to maximize durability.

What's Included

  • Left and right remanufactured LLY cylinder heads
  • Fully assembled and ready to install

Not Included

  • Gaskets
  • Head bolts
  • Injectors
  • Installation hardware

Vehicle Fitment

2004.5–2005 GM Duramax LLY 6.6L

  • Chevrolet Silverado 2500HD
  • Chevrolet Silverado 3500HD
  • GMC Sierra 2500HD
  • GMC Sierra 3500HD

Why Choose These LLY Reman Heads?

  • OE-style performance and reliability
  • Professionally remanufactured and quality checked
  • Premium machining and valve seat upgrades
  • Ideal for stock replacement or preventative engine refreshes
  • Built for long-term durability and dependable service

Core Return Information

Sold as a matched left and right pair.

To receive full core credit, a good, reusable pair of LLY cylinder heads must be returned. Cores must be free of cracks, excessive warping, or severe damage. Core returns are required within 90 days of purchase.
Shipping information

Free economy ground shipping on most orders over $200. This includes lower 48 United States only. Excludes products that must ship freight.

Core Return Info

Read Carefully!

When you purchase a product from our website that has a core requirement, you have two options:

1. You choose to pay the core charge and we will ship the product right away, then once we receive the cores you will be refunded the core charge if your cores pass our inspection qualifications. This is the preferred choice and has the least delays. 

2. You choose to send in your cores before we ship the product that was purchased. This choice has the risk of delayed shipment of your purchased product and our inventory is not guaranteed by the time we receive your cores. You will need to follow all of the instructions below as quickly as possible so that you can get your purchased product and we can receive the cores. When you choose this option you acknowledge that by the time we receive your cores, our inventory could have change and there could be a delay in your shipment. 

 

Please return all cores to:



Industrial Injection Core Returns
2858 South 300 West
Salt Lake City, Utah 84115

INCLUDE RA# THAT WAS ISSUED AT TIME OF PURCHASE! If RA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.

Core return freight is the responsibility of the customer

FULL CREDIT WILL BE GIVEN WHEN: 

In order to receive full core credit, your core(s) must be returned within 90 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection are the responsibility of the customer and their shipping company.

½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:

  • Slightly damaged housing or camshaft
  • Missing parts such as FCA

No Core Credit issued when:

  • Core is seized or hydraulic head is cracked
  • Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
  • Core is fire damaged
  • Core is returned after 90 days/3months

Please do the following when returning a core:

  • Make sure you have removed all fittings from your old unit
  • Drain all fuel and oil from unit
  • Package cores so that fuel and oil does not escape from the package

NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.

  • Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
  • All shipping charges are the responsibility of the customer
  • Please write on the box “Core Return” and have RA # clearly written on the outside of box
  • Include copy of original invoice and RGA inside box

PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RA #.
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