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#5 |
Moderator
Join Date: Sep 1998
Location: Grand Rapids, Michigan, USA
Posts: 1,001
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![]() C'mon, haven't you guys ever worked on an old 300 inline-6 Ford pickup truck? Or a pre-'70 302? Almost all of them had 18mm plug threads. Those were the standard until they wanted to increase valve size and redesign combustion chambers for more efficiency.
------------------ Capri306, Moderator, The Mustang Works Online 1979 Mercury Capri, 5.0L -- C4 -- 2.73 1987 Mustang LX Notch |
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