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Industrial Injection 2004.5-2005 LLY Duramax Ported & Polished Cylinder Heads (RH & LH Set)

Industrial Injection SKU: PDM-LLYRH
Price
Regular price $3,99595
Regular price $000 Sale price $3,99595
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  • Free Ground shipping (Over $200*)
  • Top-of-the-line Customer Service
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2004.5-2005 LLY Duramax Ported & Polished Cylinder Heads (RH & LH Set)

Unlock the full performance potential of your 2004.5–2005 LLY Duramax 6.6L with these Industrial Injection Ported & Polished Cylinder Heads. Designed for high-performance applications, these fully CNC-ported heads deliver increased airflow, and enhanced power capability for racers, sled pullers, and serious diesel enthusiasts.

Machined using Industrial Injection's state-of-the-art 5-axis CNC cylinder head porting technology, each head is precision engineered to maximize airflow consistency across all ports while maintaining exceptional durability. Fully assembled and ready to install, these heads provide the airflow and reliability needed to support demanding horsepower goals.

Key Features

  • Fully CNC ported and polished LLY Duramax cylinder heads
  • Precision machined using a 5-axis CNC cylinder head porting machine
  • CAD/CAM software-developed port design for maximum consistency
  • Diamond honed valve guides
  • Unshrouded valves for increased airflow
  • High-strength alloy, heat-treated iron-based valve guides
  • Premium nickel-based, non-magnetic valve seat inserts
  • Multi-angle valve job
  • 130 lb valve springs installed
  • Fully assembled and ready for installation
  • Designed for racing, sled pulling, and high-performance applications

Advanced CNC Porting Technology

Each cylinder head is machined on Industrial Injection's advanced 5-axis CNC porting equipment utilizing proprietary CAD/CAM-developed port designs. This process ensures precise port-to-port consistency while significantly improving airflow compared to factory cylinder heads.

The result is increased airflow efficiency, improved combustion characteristics, and enhanced power potential throughout the RPM range. Whether you're building a competition truck or a high-horsepower street setup, these heads provide the airflow necessary to support your performance goals.

What's Included

  • Right-hand LLY ported and polished cylinder head
  • Left-hand LLY ported and polished cylinder head
  • Fully assembled and ready to install

Not Included

  • Gaskets
  • Head bolts or studs
  • 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 Industrial Injection Ported & Polished Heads?

  • Fully CNC ported for maximum airflow and consistency
  • Built specifically for racing and sled pulling applications
  • Premium valvetrain and seat components for long-term durability
  • Increased airflow compared to stock cylinder heads
  • Ready-to-install assembly saves time and labor
  • Manufactured and assembled by Industrial Injection performance experts

Core Return Information

Sold as a matched right-hand and left-hand 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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