[Chevelle-list] Off List - Stripped Spark Plug

[Dennis.McGillis]

My son's 2002 Expedition just spit out a spark plug which stripped the threads. 
 There seems to be no room to get drilling or tapping tools at it while in the 
car.  A San Diego dealer wants to remove the aluminum head and either replace 
it for $3500 or install a helicoil for $800.  Does anyone know of a better 
(cheaper) way to cure this?
Thanks,
Dennis McGillis