SHELBY GT-40 ULTIMATE Member
Joined: Feb 2007
The plugs for the 5.0 usually takes a 5/8 spark plug socket. Pull the boot off and you might need extensions for a few of them. You want to be very careful when trying to get them loose, plugs have a tapered seat and tighten up but when they come loose you can really bang your hands and fingers. Just be aware of where your hands are for when that plug comes loose.
Take your time when installing the new plugs, it's easy to crossthread them. They shouldn't need to be forced, so if it doesn't go smoothly in you might want to try it again. When you tighten it with the socket, you don't want to honker down too much on them. They'll be much tighter to take out the next time if you do.
If you've never done this before, the best thing to do is take one out/replace it/reinstall the plug wire. That way you don't get the firing order mixed up. One plug at the time.
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