According to GM Shop manuals Cylinder Head Bolt torque is 60-70 ft-lbs. I have found that if you follow the procedure to progressively increase torque in 20 ft-lb increments as you follow the torque sequence you will properly seat/seal the head gaskets. This is true with either steel shim or "sandwich" gaskets. I also re-torque the bolts one additional time within a half hour after I have set the total torque.
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