Important: Use new cylinder head bolts. The required tightening method stretches the bolts, therefore the cylinder head bolts are not reusable.
Tighten the cylinder head bolts (1 thru 8), using the tightening sequence shown.
Tighten
Tighten the cylinder head bolts to 25 N·m (18 lb ft)
on the first pass, 90 degrees on the second pass, 90 degrees
on the third pass, 90 degrees on the fourth pass and 15 degrees
on the fifth pass.