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Prior to installing the head gaskets and laying the heads on, we chased the head bolt threads with a tap. Steve torques the head bolts according to the manufacturer’s sequence, and in three torque steps. The first step is to torque down to 40 ft-lb. He then repeated the sequence with the torque wrench set to 60 ft-lb. For the final sequence, the torque wrench is set to 70 ft-lb.