Important: Use new cylinder head bolts. The required tightening method stretches the bolts, therefore the cylinder head bolts are not reusable.
Tighten
Tighten the cylinder head bolts, using the tightening sequence in the
illustration, 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.