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Mk3 golf gti 8v head bolt torque settings?

The cylinder head bolts on a Mk3 Golf GTI 8v should be tightened to the following specifications:

- Step 1: Fasten all head bolts to 20 Nm.

- Step 2: Fasten all head bolts an additional 1/4 turn(90°).

- Step 3: Release all head bolts and wait for 15 minutes

Retighten in sequence

a. 20Nm

b. 1/4 turn

c. 1/2 turn

d. 1/2 turn