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06-22-2019, 11:04 AM | #1 |
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Join Date: Sep 2017
Posts: 385
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Spark Plugs C-4 Take Apart With Green # and letters
I have a NOS set of Four and would like to know what they fit and when the Green color was used..Have not seen many that way..
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06-22-2019, 05:15 PM | #2 |
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Join Date: May 2010
Location: Oregon
Posts: 1,377
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Re: Spark Plugs C-4 Take Apart With Green # and letters
Champion C-4 plugs were the replacement for the original 3-X plugs and for the Model-B. They were made over many years and in many iterations: black take-apart, non-take-apart, zinc coated, etc. I have some marked "Made in Canada".
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06-22-2019, 06:19 PM | #3 |
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Join Date: May 2010
Location: Wichita, Kansas
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Re: Spark Plugs C-4 Take Apart With Green # and letters
Actually Model B’s used the 3X. C-4’s were for the early V-8’s.
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06-22-2019, 07:16 PM | #4 |
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Join Date: May 2010
Location: Auburn Washington
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Re: Spark Plugs C-4 Take Apart With Green # and letters
John Stone is right on. the C-4`s can be used in the A`s an B`s but they are not correct for them. they do NOT go deep enough into the head. the 3X is the correct plug.
that is all I will run in my A`s. |
06-23-2019, 03:40 PM | #5 |
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Location: Cape Cod MA
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Re: Spark Plugs C-4 Take Apart With Green # and letters
In 1932 Ford introduced a V8 engine and the C-4 spark plug was the official spark plug made for that engine and recommended by Ford.. The 3X was the official Ford Motor Company spark plug for both the Model A and Model B.
In 1933 the Ford V8 engine for that year and subsequent years did not use the C-4 and they would not fit. Now suppose you operate a spark plug company who had thought Ford V8 would use the C 4 for a long time, and had produced large quantities of C 4 to meet the supposed demand. Very likely what happened is that those C 4 plugs in the warehouse will fit the Model A and the Model B, and while not Ford recommended plug the heat range on them is close enough for satisfactory service so advertise them for aftermarket use on the A and the B. This is my guess as to the reason they were promoted as the aftermarket replacement spark plug. |
06-23-2019, 04:06 PM | #6 |
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Re: Spark Plugs C-4 Take Apart With Green # and letters
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06-26-2019, 12:12 AM | #7 |
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Location: Portland OR
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Re: Spark Plugs C-4 Take Apart With Green # and letters
I miss read the title and was thinking of Splitdorf which were green.
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