How many sets of freeze plugs are on the head? It looks like there is one set, about 3/4" in diameter above the exhaust manifold and one set about 3/8" in diameter just below. Started the truck up today and it was leaking coolant all over the place at the back of the motor on the passenger side just behind #6 cylinder exhaust port on the head. It looks like the leak is coming from one of these "small freeze plugs". Either way it looks like the monkeys at the dealer will have the head off the motor. 
