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01-24-2022, 06:07 PM | #1 |
Member
Join Date: Jun 2018
Posts: 64
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Model A spark plug chart identification
Evening all. Can anyone ID this Model A spark plug chart? It has a#17 at the bottom corner, so it was part of a book? Some of the info is in conflict with judging standards, such as the "3" in the 3X plugs has a flat top, not rounded. There is a 3X , dated 1-29 to 11-30, with the knurling different than the standards. Curious where this came from and accuracy issues.
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01-24-2022, 06:50 PM | #2 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,425
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Re: Model A spark plug chart identification
It came from a MARC newsletter. Here is a link.
https://www.fordbarn.com/forum/showt...2931&showall=1 |
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01-24-2022, 06:53 PM | #3 |
Senior Member
Join Date: Aug 2012
Location: South East Wisconsin
Posts: 1,279
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Re: Model A spark plug chart identification
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