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EFV-8 Club Forum / General Ford Discussion / Spark Plugs?

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Discussion Topic: Spark Plugs?

ibshane

11-03-2017 @ 6:05 AM

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Posts: 147
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I am getting ready to put fresh plugs in my 1937 Model 78 V8-85
The current plugs are "Champion UD16" Is this a good plug?
Or is there a particular plug that has proven out to be better for this engine?

Thanks Guys!

ken ct.

11-03-2017 @ 9:48 AM

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I have a 36 and use Champ "D-21" which are slightly hotter plug. Been using for past 20 yrs. , I assume these are 18 mm plogs. ken ct

ibshane

11-03-2017 @ 9:37 PM

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Thanks ken ct,
Yes..., mine are 18mm in cast iron heads.
I finally found online that Champion #7 was the original plug for the '37 V8-85 which cross-references to:

Champion D16
Autolite 386
NGK AB-6 (2910) and a bunch of others.

Is the Champion D-21 a hotter plug than what is spec. for your '36? If so....., Is there an advantage to using a hotter plug?

ken ct.

11-04-2017 @ 12:59 AM

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Cant answer your question on specs, but 21's run much cleaner than the 16's. Same spec I would assume. Try a set you will like them. ken ct Been using them for like 20 yrs and 40,000 miles. NGK's suck.

ibshane

11-04-2017 @ 1:13 AM

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Might have to give the D-21 a try.
The UD-16 plugs that came out do look pretty fouled!

Thanks!

TomO

11-04-2017 @ 7:20 AM

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A hotter plug is needed when a car is driven at low speeds only. If most of your driving is less than 40 mph, use a hooter plug.

Tom

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