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GMC-2002-Dmax said:

From what we "hear" the current engine is still being used until the supply runs out, then all the Duramax engines will be the new design.

Hp/Torque figures are not set in stone as of yet. I have heard 320 ish/560 ish

Redesigned valve covers and external plumbing for the fuel rails as well as a possible or probable redesign of the injector cup seals.

Time will tell.

I heard they are getting rid of the injector cups all together. The injectors will seal directly to the head at the combustion chamber.
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