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spark plug hole size??

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    spark plug hole size??

    Hey guys, i was looking to get a compression gauge tester, and found a couple available @ Harbor Freight....i'll probably get the one that doesn't have all those extra thread sizes for various holes, seeing how I mostly work on my car and hardly anybody elses.

    The Question: Does anybody know the spark plug hole size of our DOHC's???
    more specifically, is it 14 or 18 mm?? If not, then I'll just get the other tester kit that has about 6 different hole sizes to accomodate.
    Chris
    94 protege lx - gone and will be missed
    2008 Mazda3 - recently acquired

    "Life is tough, but it's tougher when you're Stupid."
    -John Wayne
    http://www.cardomain.com/ride/2978373
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