What is it that the TimeSert is going to grip to?
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Some time in the 2003 production run GM switch from 11mm X 1.50mm bolts to 11 X 2.0 bolts. This is a much courser bolts and can grip better. I have not seen 1 failure yet.
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I will start in on the head gasket design flaws now.
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The block and head expand and contract in the heat cycles.
This leads to the head gasket bunching up in this area.
Because of this open area the head gasket will look like this.
This is an old picture of some of my Good parts. The collection has grown