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You should not use anti-seize on spark plugs.
This changes the the actual tension on the threads. None of the manufacturers recommend it, and even Permetex (the maker of most anti-seize) says not recommended for spark plugs. If you do use anti-seize, you should actually torque to 50% of the max spec, or 7 ft/pounds. Dry plugs should be torqued to 14 ft/pounds.
The threads on the V10 were increased to 8 threads on 2000 and newer V10s. These should not have a problem unless somebody really screwed up installing replacement plugs.
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2000 E350 DRW XLT extended wagon (yes! it's a dually!)
17" Ultra Goliath rims
Banks Powerpack, Diablo Predator
Buckstop front bumper, Reunel rear w/ 20,000# reciever
250,000+
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