Most manufacturer's torque specs use 15 to 25 ft. lbs between passes, with an initial pass from 20 to 30. I.E.: The 3.1 v-6 Chevy I did last week was 22, 35, 55, then 55 again. Loosen one turn(bolt sequence in reverse), then tighten to 22, then 90 degrees(1/4 turn).
I'd probably start at...