Car Stall problems of the 1999 Ford E-450

I found out that because of a design flaw in the Ford triton engine cylinder heads they are prone to "spark plug blow out". In certain instances this can result in fire as the spark plug becomes a missile and can break fuel lines etc. After such an event the repair for out of warranty vehicles can easily be well into the thousands of dollars and Ford will accept no responsively. I own such an engine and in the interest of possibly preventing this, I have looked into replacing the spark plugs far earlier than Ford maintenance recommends and install the new ones per the latest information regarding the use of anti-seize products on the threads. Because of this design, it seems that to replace 10 spark plugs in my RV exceeds $1000. This is outrageous and Ford should be required to step up to the plate and accept liability for their error.