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

2004.5-2005 LLY Duramax Premium Stock Plus Cylinder Heads (RH and 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.