Cavitation can be a serious problem...
We had a customer bring in their 7.3 with a coolant leak on the front cover. Our mechanic was concerned it could be a cavitation issue. We have seen cavitation wipe out an entire engine. Thankfully, that was not the case for this customer.
We have seen some extreme cooling package issues and
Proper coolant maintenance can go a long way...
Ford sells a coolant additive that helps to reduce cavitation in the Super Duty.
Test strips are available to check the pH of your coolant. Improper pH creates a bigger risk for cavitation.
Remember when filling your coolant to use the proper ratio of water to antifreeze and use distilled water. Tap and well water can throw off your coolants pH.
If you ever find yourself in a situation where you must add tap or well water to your coolant, be sure to have your coolant completely flushed as soon as possible.
Remember to regularly check your coolant. Make sure to check only when your engine is completely cooled. A hot radiator cap can blow off and cause severe burns if checked when hot or under pressure.