INDUSTRIAL INJECTION PDM-LLYRH GM RACE HEADS FOR 2004.5-2005 LLY 6.6L DURAMAX

The Industrial Injection LLY Duramax Race Heads are designed for the racer / sled puller in mind. Fully CNC ported heads complete ready to bolt on.

Heads are first jet washed in a high pressure spray cabinet to remove oil and dirt, then glass beaded to remove carbon. Next they are checked by magnafluxing, (cast iron only) or pressure testing. They are visually inspected for defects that would make them unusable. Valve guides and seats are removed as needed for porting.

Port development is accomplished using a superflow 600 flow bench with a computer recording all flow measurements.

Many things are considered when designing a cylinder head Port; air flow is only one of the things to think about. Another major concern is port wall thickness.

Anyone can get a head to produce high flow numbers, but if doing so leaves the port wall to thin the casting will crack. High performance Diesel heads are more prone to crack because of the thermal shock experienced by excessive intermittent or long term exhaust temperatures.

The porting is then preformed using a new 5 Axis CNC Cylinder Head Porting Machine with CAD/CAM software specifically designed for cylinder head porting. CNC porting brings unparalleled accuracy to head porting with each port flowing the same. This helps balance the power that each cylinder produces, making tuning easier.

New High Strength Alloy, Heat Treated iron based valve guides are installed. These guides are heat treated to Rockwell 22 Scale, which produces the ultimate in wear resistance. This is far superior to original guide material, including Bronze.

The guide incorporates a spiral grove inside the guide to hold oil and aid the lubrication of the valve during engine operation.

Guides are then honed (not reamed) to exact size using a diamond honing mandrel. Diamond abrasives allow for consistency of size, surface finish, and bore geometry with no variation from guide to guide. The guide size is then verified using a valve guide bore gauge.

As needed the head receives new Premium valve seat inserts made from a true Nickel Based Non-Magnetic material that was developed for extreme operating conditions.

Next the head is treated to a multi angle valve job to help maximize the flow of air in and out of the head. This is accomplished using a Serdi 100 guide and seat machine. Serdi uses a solid carbide straight shank pilot.

When inserted into the valve guide, it simulates the real valve stem during the centering process. This guarantees the valve seat is finished for a perfect valve to seat match.

Using CBN or Diamond tooling the head is given a new surface. With our berco milling machine we can control the surface finish to accommodate different head gasket types. For example MLS head gaskets require a very smooth surface finish.

Finally the head is jet washed dried and assembled with new valve seals and new performance valve springs.

Features:

• 5 Axis CNC Cylinder Head Porting Machine with CAD/CAM software specifically designed for cylinder head porting
• Diamond Honed Guides
• Unshrouded Valves
• High Strength Alloy, Heat Treated iron based valve guides
• Premium valve seat inserts made from a true Nickel Based Non-Magnetic material
• multi angle valve job
• Peformance 95LB valve springs
• Sold in a pair

Note: To receive full core credit we need a good, re-useable pair of cylinder heads. No cracks, warping, or excessive wear

The INDUSTRIAL INJECTION PDM-LLYRH GM RACE HEADS are expertly engineered for the 2004.5-2005 LLY 6.6L Duramax diesel enthusiasts, specifically tailored for high-performance racing and sled pulling applications. This pair of fully CNC ported heads offers a seamless bolt-on solution, making installation straightforward for any serious racer.

Each head undergoes a meticulous cleaning process, including high-pressure jet washing followed by glass beading to eliminate any residual oil and carbon deposits. After this, they are subjected to rigorous quality checks, including magnafluxing and pressure testing, ensuring they meet the highest standards. Visual inspections guarantee that only heads free from defects proceed to the porting stage.

The meticulous port development process utilizes a state-of-the-art Superflow 600 flow bench, capturing precise measurements to optimize airflow while maintaining appropriate wall thickness throughout the casting. Achieving high flow numbers without compromising durability is essential, particularly in high-performance diesel applications exposed to extreme thermal regimes.

Porting is executed using advanced 5 Axis CNC technology, which, paired with CAD/CAM software, ensures consistent performance across all ports. This balance aids in tuning and efficiency, pivotal for competitive racing. High-strength alloy, heat-treated iron-based valve guides are also installed, showcasing exceptional wear resistance due to their unique spiral groove design, which enhances lubrication.

Additionally, premium valve seat inserts made from nickel-based, non-magnetic material enhance performance under extreme conditions. Complementing these features is a multi-angle valve job processed with precision to ensure optimal airflow. The heads are finally assembled with new valve seals and top-performance 95LB valve springs, ready to empower your Duramax engine with unmatched performance and reliability. Ideal for those who demand excellence in every race, this product is sold in pairs, with a requirement for reusable cores to receive full credit.