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Old 11-16-2020, 08:16 PM   #1
1crosscut
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Default Numbers on C-4 spark plugs

I've started working on cleaning up some C-4 spark plugs. After taking several of them apart I've noticed that there are numbers towards the bases of the porcelain that are hidden when they are assembled. Most have a number but some do not.
Any idea as to what the numbers represent?
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Old 11-17-2020, 01:19 AM   #2
J Franklin
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Default Re: Numbers on C-4 spark plugs

Pre bar code
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Old 11-17-2020, 12:02 PM   #3
katy
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Default Re: Numbers on C-4 spark plugs

I would guess some sort of production code.
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Old 11-18-2020, 06:57 PM   #4
1crosscut
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Default Re: Numbers on C-4 spark plugs

A mystery that may never be solved.
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Old 11-18-2020, 09:32 PM   #5
Sunnybrook Farm
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Default Re: Numbers on C-4 spark plugs

Probably which machine made the part, if there was a problem they would want to know where it was coming from.
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Old 11-19-2020, 11:34 AM   #6
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Default Re: Numbers on C-4 spark plugs

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Have you tried contacting Champion?
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