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Need head gaskets replaced. What is the process needed to perform this repair and do the heads need to be machined?
 

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Not sure of the this process on a Duramax, but you should have the heads checked with a good straight edge (length, width, and corner to corner) to ensure they haven't warped. I would also recommend to have them checked for cracks. I had the head gasket replaced under factory warranty on my Cummins twice and it didn't seal either time, so I ended up having a private shop do the job and they sent the head to a good machine shop to be checked. The machine shop checked the head, no cracks, but they had to machine a .006" warp . It has been good to go since then.
 
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