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Head bolt tightening sequence and torque for opel corsa 1.8 GSI?

Tightening Sequence

1. Tighten the head bolts in numerical order, starting from the center and working your way outward.

2. Tighten the bolts in three steps:

- Step 1: Tighten the bolts to 29 Nm (21 ft-lb)

- Step 2: Tighten the bolts to 40 Nm (29 ft-lb)

- Step 3: Tighten the bolts to 50 Nm (37 ft-lb)

Torque

50 Nm (37 ft-lb)