The Jalopy Journal
If you can't get at the back side it's a problem. Best way is to cut out the bad section, use 3003 Aluminum, make a new section regardless, 3003...
I'am wanting to purchase Motorcraft TT4 sparkplugs, I've tried all parts houses to no avail. They are a bit colder. Or their equivalent.
Where can I find Motorcraft TT4 spark plugs
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The Jalopy Journal