6.6L LB7 GMC and Chevrolet Duramax Stage 1 Cylinder Heads

This upgraded diesel engine cylinder head is a great choice for an improvement over stock.

Duramax 6.6 LB7 Remanufactured Cylinder Heads Include:

• Resurfaced Cylinder Head To Meet Or Exceed OEM Specification of Ra or Roughness Average, which maximizes sealing surface performance.
• NEW Valve Stem Seals
• Grind Valves to proper Ra finish and concentricity
• Cut new 3 angle seat profile with less than .001 concentricity for valve sealing
• NEW Injector Cups and O-rings
• New Valve Guides

Cleaning Process

Once it 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 it will be shot blasted in our cabinet to remove any rust and scaling. This will also relax the material before machining to our specifications.
After this it will be checked for any broken bolts or studs, and removed.
Once the cylinder head 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.

Inspection Process

We pressure test the cylinder heads  with 40 PSI pressure to make sure there are no leaks and then will again go through another extensive cleaning, quality control inspection and sign off sheet that will include all specs of the heads. We measure the following specs:

• Valve recessions
• Stem Heights
• Installed Spring Heights
• Spring Pressures
• Keeper and Lock Positions
• RA Recording by use of profilometer

CORE FEE: $400

*Check the ticker at the top of this page to see current lead times