Current Lead Times: In Stock Engines Ship Same or Next Day - Out of Stock: 1-3 Weeks on Most Long Block Engines; 3-5 Days on Heads – *call us for more exact lead times for your specific build 

LB7 Workhorse Plus Cylinder Head Reman



This upgraded 6.6 Duramax Diesel engine cylinder head is a great choice for an improvement over stock. This listing is for 1 Cylinder Head.
6.6 Duramax Lb7 Workhorse Plus Cylinder Head Reman
Choate Part Number: CEPLB7WPHR
OE Part number: 97779578
Fitment: 2001, 2002, 2003, 2004
Manufacturer: Choate Engineering Performance

6.6 LB7 Workhorse Plus Duramax Remanufactured Diesel Engine Cylinder Heads Include:

  • Resurfaced Cylinder Head To Meet Or Exceed OEM Specification of Ra or Roughness Average, which maximizes sealing surface performance.
  • Used Cast
  • New Valve Stem Seals
  • New Valve Guides
  • Regrind Valves and inspect margins for proper sealing.
  • Cut seats with 3 angles and optimize flow.
  • New Injector cups and oring’s
  • Machined O’rings
  • Heavy Duty Valve Springs 130lb. seat pressure at 1.720 (to the top of the retainer) installed height.

Cleaning Process:

Once the 6.6L Workhorse Plus Duramax Diesel Engine cylinder head passes our rigorous inspection for cracks and imperfections through MPI testing, it will go through a stress relieving process in a furnace to turn any grease and oil into ash.
Then we shot blast it in our cabinet to remove any rust and scaling. This will also relax the material before machining to our specifications.
After this, we check it for any broken bolts or studs, and remove them.
Once it has met our stringent standards, it will then start through the machining process.
Machining Process:
Our heads are blueprinted to proprietary valve train geometry, to alter valve height and valve recession for maximum reliability and longevity. Our Valve stem heights are altered to remove preload on the lifter and decrease the wear and help the lifter live a long life.
We O-ring our Workhorse heads to eliminate factory head gasket issues. A receiver groove is machined into the deck surface, and a USA-made stainless steel wire is pressed in, applying extra pressure to the MLS gaskets and sealing combustion pressure. The durable, reusable high-carbon stainless wire works with standard head gaskets and requires no special block machining—just a clean, dry, flat deck surface.
Inspection Process:
Once our machining processes are complete, we pressure test the 6.6 Workhorse Duramax cylinder heads with 40 PSI pressure to make sure there are no leaks. Then we send it through another extensive cleaning, quality control inspection and sign off sheet that will include all specs of the heads.
We measure the following specs by use of profilometer:

    • Valve recessions
    • Stem Heights
    • Installed Spring Heights
    • Spring Pressures
    • Keeper and Lock Positions
    • RA Recording

Tech Tip:

Be sure that the surface of the block is inspected and cleaned prior to installation of this Cylinder Head.

6 Months warranty on Cylinder heads. Parts warranty only.

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*If you know your vin number before hand it is very helpful during the quotation period. Please note that this will be required before the engine is built.

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