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EFV-8 Club Forum / General Ford Discussion / 1940 V8 Spark Plugs

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Discussion Topic: 1940 V8 Spark Plugs -- page: 1 2

sarahcecelia

05-05-2021 @ 2:53 PM

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I bought mt 1940 Cvt. about 3 or 4 years ago, and it always ran good and started on the first crank!

Today it started and faltered and died several times. I took the plugs out to check them, and they were all fouled with black soot. I proceeded to wire wheel them and then check the gaps on them. They are H10c's; what does that C designate? (cold?)

I checked all of the gaps and they were all set to 20 thousands!! I reset them to a "loose" 31 thousands and re-installed them; and again it starts easily and runs well. Whomever set those plugs didn't know diddly about the car. I can't believe it ran so well the past few years with that small plug gap!

. I'm going to order a set of H10 Champions, unless someone that knows, on the forum, tells me that it takes a dfferent one. I'm not that familiar with the 40 V8, but my thinking tells me that they , like the 50'series V8's, take champion H10's.

Regards, Steve Lee

This message was edited by sarahcecelia on 5-5-21 @ 2:54 PM

51504bat

05-05-2021 @ 3:26 PM

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Autolite 216's will work as well. I'm running Autolites but previously used Champion H10's. Not sure I noticed a difference.

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kubes40

05-05-2021 @ 3:37 PM

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Steve, .025" is correct.
The "C" indicates copper core.
Heck, I use authentic H10's, two rib plugs in my cars and they run wonderfully.

Mike "Kube" Kubarth

40 Coupe

05-06-2021 @ 4:31 AM

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The C is for a copper coating on some of the internal parts which cuts down on corrosion, not a bad idea for our style of driving. H-10 or H-10C are OK. Ford recommended 0.030" as plug gap.

kubes40

05-06-2021 @ 6:19 AM

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Mike "Kube" Kubarth

This message was edited by kubes40 on 5-6-21 @ 2:30 PM

JayChicago

05-06-2021 @ 8:51 AM

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I didn’t know Ford recommend .030. I recall reading many posts here and elsewhere recommending .025 or .026.

1931 Flamingo

05-06-2021 @ 12:56 PM

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My mechanic installed NGK plugs, not sure which ones.
Paul in CT

sarahcecelia

05-06-2021 @ 5:24 PM

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Thanks Kubes; OOPs; I thought they would gap the same as my '50 v8 at 32 thousandths.

Regards, Steve Lee

sarahcecelia

05-06-2021 @ 5:32 PM

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Autolites can give you problems; even though they are a Ford product! Champions are the brand recommended by FORD!

Regards, Steve Lee

JayChicago

05-06-2021 @ 6:35 PM

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“My mechanic installed NGK plugs, not sure which ones.
Paul in CT”

NGK-4
Or NGK-6 , which is a little hotter, may help if needed to burn off deposits.

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