| rogbell | -- 03-12-2016 @ 11:09 AM |
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Want to tune up my '36 flathead but don't know what spark plugs I should buy and use? Suggestions please. Thanks.
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| ken ct. | -- 03-12-2016 @ 11:19 AM |
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Ive used Champion (D-21) in mine for 25 yrs. Nice hot plug. ken ct. These are 18 mm plugs not smaller 14 mm.
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