You've got to get your plug out to do this, but you might be able to just drill the whole thing out and use this tool:
One thing you could do, that I did with great success on an F-150 with a blown-out spark plug, is use a cal-van kit.
Google "cal van f150" to see it. To put it in:
- Make sure valves are closed with included plug/compressor hookup adapter
- Drill out existing plug hole with included oversized drill bit and guide
- Blow metal out of cylinder with compressor (if the valve is closed, you just blast air until it's clean)
- Tap hole with provided tap/guide
- Blow metal out of cylinder (can't be too careful)
- Screw spark plug into included insert sleeve
- Put JB Weld on insert sleeve outer threads
- Install spark plug with sleeve into new oversized hole (the JB weld will make sure it holds
Wait a few days, and it's fixed. No new cylinder head needed. Cost me $80 for the cal-van kit + 40 for an air ratchet (I had a compressor)
I did it to an F-150 I got and I've put 25K miles on it with no issues at all.
See this video: https://www.youtube.com/watch?v=xGvFev7XqkA