According to (the latest bulletin regarding head/gasket prep and install):

Bulletin No.: 06-06-01-006C


Date: October 30, 2009


Subject: Information on 6.6L LBZ, LB7, LLY Duramax(R) Diesel Engine Cylinder Head Gasket Design Change - New Head Gasket Part Numbers and Head Bolt Torque Specifications


Models:
2001-2006 Chevrolet Silverado
2003-2006 Chevrolet Kodiak C4500/5500 Series
2006 Chevrolet Express
2001-2006 GMC Sierra
2003-2006 GMC TopKick C4500/5500 Series
2006 GMC Savana
with 6.6L Duramax(R) Diesel Engine (VINs D, 1, 2 - RPOs LBZ, LB7, LLY)

[snip]

Special Cleaning Requirements
For 2001-2006 vehicles produced with the first generation head gasket, special attention must be given to the cleaning of the engine block and cylinder head surfaces when servicing with a second generation gasket. The crimped areas (1) on the first generation gasket may, over time, allow corrosion buildup where they contact the block and cylinder head surfaces. The second generation gasket has raised ribs that seal at these crimped areas (1). A special cleaning procedure is required to ensure proper sealing.


Cleaning Procedure
1. Remove the old head gasket using service manual procedures. Save the gasket for reference until the repair is completed.
2. Place clean rags in the cylinder bores and pushrod openings in order to keep out debris.
3. Use the J-28410 or equivalent to carefully clean the gasket sealing surface of large sealing or corrosion matter. When scraping, take care not to scratch or gouge the metal surfaces. Do not push the debris into oil, coolant, and combustion openings or bolt holes.
4. Inspect the gasket sealing surfaces for corrosion, especially in the areas that were in contact with the crimped tabs of the first generation head gasket. If corrosion is present, continue with the rest of the steps in this procedure for proper cleaning. If the sealing surface is sufficiently clean and smooth, use the revised torque specification listed towards the end of this bulletin and continue with published service manual procedures to complete the repair.
5. For surfaces that have corrosion or pitting, wrap a piece of flat steel (4"x 2" or larger) with 600 grit wet grade sand paper. Using Moisture Displacing Lubricant, P/N 88862629 (in Canada, use 89020803) or equivalent, wet sand the block surface to remove any remaining gasket material or corrosion. Do not use any paper coarser than 600 grit.
Notice
- Do not use any power type sanding devices.
- Do not use a wire brush or wheel to clean gasket surfaces.
- Do not use chemical cleaning agents on gasket surfaces.
6. Take care to keep the sanding block parallel to the block surface and evenly sand the sealing surface. Some areas of corrosion will still show a stain. Do not attempt to wet sand these areas down to a shiny metal surface.
7. Change the sanding paper when it becomes clogged. Carefully and frequently wipe the surface, using a clean cloth each time, to prevent sanding debris from building up and contaminating the oil and coolant cavities.
8. Clean the bolt threads and holes and remove the rags from the bore cavities and pushrod openings.
9. Repeat the above cleaning procedure on the cylinder head gasket surface.
10. Clean the engine block and cylinder head gasket surfaces with Brake Parts Cleaner, P/N 88862650 (in Canada, use 88901247) or equivalent, to remove any traces of oil or debris.
11. Using the revised head bolt torque specification below, reassemble the engine with NEW M12 cylinder head bolts according to service manual procedures.


Also:

Bulletin No.: 07-06-01-009A
Date: November 02, 2009

Addresses head gasket thickness identification, Gen 1 crimped gaskets vs. Gen 2 riveted gaskets, and revised head bolt torque and angle procedure. DO NOT use the original Gen 1 head bolt torque procedure with Gen 2 riveted gaskets. Definitely worth a read.

RTFM (note to self)