Actually, rather than replace the head, you can fix the spark plug hole with a "Time-Sert":
http://www.timesert.com/
One thing they talk about on the site, "
Ford spark plug blow-out?
Repair kit part number 5553 Ford Triton spark plug kit will repair blown out spark plug's in Ford heads."
Here's the page for Ford's repair kits:
http://www.timesert.com/html/sparkplugford.html
I've used these for years, and they work great!
Much better than a Helicoil, as the Time-Sert retains full thread strength!
But....I would STILL recommend removing the head to do this repair, so as to avoid metal chips/shavings from falling into the cylinder, but you'll save the cost of a new head!
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