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Do not use grade 8, the heat will weaken it. What you need to do is find stainless steel bolts since your heads are aluminum on that truck. I have a 4.2 vortec in my trailblazer and the front 7 bolts kept loosening, so i took them out and replaced them with stainless bolts with a stainless lock washer, and put on some anti-seize.
