Install the cylinder head, then tighten the cylinder head bolts sequentially in 3 steps:
Step 1: 29 ft. lbs. (40 Nm).
Step 2: 51 ft. lbs. (70 Nm).
Step 3: 72 ft. lbs. (100 Nm).
Be sure to torque the bolts in a circular pattern - from the inside bolts outward to the outside bolts.