•Tighten cylinder head bolts progressively in the sequence illustrated to: XXXXX XXXXX25 Nm (18 ft. lbs.). Stage 2-25 Nm (18 ft. lbs.). Stage 3-25 Nm (18 ft. lbs.). Stage 4-Using an angle torque gauge, tighten bolts in the same sequence to 180°.
I checked two more databases and the procedure/specification is the same so working from experience if you increase the torque by 18 ftlbs each stage you are at 54 ftlbs before you turn the final 180 degrees.
Sorry I did not include the intake manifold in the first post
Taken from
http://www.justanswer.com/car/3agnn-...ence-head.html
will try and double check on Rave later