industrial-pdm-llyrh
industrial injection

Industrial Injection Cylinder Head - Race - 04.5-05 GM Duramax

Thoroughbred Sku #: IISPDM-LLYRH-CRE

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Prop 65:
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
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$3,355.12

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Product Details

Product Name: Cylinder Head
Manufacturer: Industrial Injection
Manufacturer Part #: PDM-LLYRH
Thoroughbred Diesel Part #: IISPDM-LLYRH
Fitment Notes: 2004.5-2005 GM 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 œC 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.


Reviews

  • Are these ported heads sold individually or as a set?

    Travis Embler | 5/6/2020

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