I have been advised to torque the head bolts on the D to as much as 20 ft lbs over spec. This would take it from 208 ft lbs to as much as nearly 230 ft lbs. What numbers do you use? Do you torque over spec? Is 208 ft lbs enough torque? It is a beefy engine. Gary -- In the Ozark Mountains of South Central USA where both life and I move at a leisurely pace.