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What are the torque settings for head bolts on a z18xe vauxhall?

The torque settings for the head bolts on a Z18XE Vauxhall engine are as follows:

Step 1: Initial tightening to 20 Nm

Step 2: Tighten bolts in sequence to 40 Nm

Step 3: Tighten bolts in sequence a further 90 degrees