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

2004.5-2005 LLY Duramax Ported and Polished Cylinder Heads (RH and LH Set)
Unlock the full performance potential of your 2004.5-2005 LLY Duramax 6.6L with these Industrial Injection Ported and 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 and 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.