07-29-2001, 07:07 PM
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#3
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Moderator
Join Date: Sep 1998
Location: Grand Rapids, Michigan, USA
Posts: 1,001
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EASY SOLUTION: get Champion RF18YC spark plugs. The 18mm thread will fit right in there. 
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch
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