Timing chain jump

Jason6937

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I have a 2000 GMC Jimmy that had a blown head gasket and a cracked head. I fixed all that over the summer and had a great time doing so. So my question is, how possible is it for the timing chain to jump when it broke down? I had slite valve stem damage along with the push rods, not all where bad. Has anyone had this experience or know the possibilities?
 
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