All the torque wrenches on the line are computerized to ensure the proper torque rating and number of hits are applied. In the case of the cylinder head bolts, they are torqued twice. First they are torqued to stretch them out. Then they are loosened and given their final torque of 50 n•m plus a 3/4 turn. The pattern starts in the center and alternates its way out to finish on the rear two bolts.