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Old 08-06-2022, 09:31 AM   #1
rockfla
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Default Any V12 guys?

Asking for a friend…..what is your spark plug recommendation for 1940 V12?? Or what you’ve found runs the best?? AND or is it better to have one slightly hotter than recommended???
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Old 08-06-2022, 04:36 PM   #2
drolston
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Default Re: Any V12 guys?

In general for a flathead that that is not pushed very hard, one range hotter plugs may be a little less likely to foul, when puttering around town in traffic. I would not fret over the choice.
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Old 08-06-2022, 04:44 PM   #3
tubman
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Default Re: Any V12 guys?

Not much help, but the Pierce-Arrow derived V12 in my '48 Seagrave fire engine took Champion H10's. They worked great in it. The only problem was that with dual ignition, it took 24 spark plugs. I ran every hardware and lawn and garden store within 20 miles out of plugs when I changed them.
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Old 08-06-2022, 07:39 PM   #4
rotorwrench
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Default Re: Any V12 guys?

Spark plugs can be a back and forth item. Different folks have different opinions about manufacturers. The V12 Lincoln engine can use the same plugs as the Ford L head V8. There are a lot of threads on here about spark plugs.

If it was made by Ford it is welcome in the barn. Ford made B model 4-cylinder engines, V8 60 engines, N model tractor 4-cylinder engines, 85 & 95 HP V8 engines, and 90-HP G series 6-cylinder engines even before WWII started. The Lincoln and Mercury cars are popular cars on here too.
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Old 08-06-2022, 08:07 PM   #5
Tim Ayers
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Default Re: Any V12 guys?

If the V12 does indeed take the same plug as its V8 brethren, the popular modern replacement for a Champion H10 is a the NGK B4L. Hotter version is the B6L.
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Old 08-07-2022, 07:11 AM   #6
48-710
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Default Re: Any V12 guys?

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Tim,
Pm message sent.
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