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04-11-2019, 08:30 AM
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#14 |
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Senior Member
Join Date: May 2010
Location: PASADENA, CA
Posts: 1,962
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Re: Champion No. 20 Spark Plugs
Model A spark plugs have a longer reach which puts the electrodes down into the combustion chamber.
The # 20 plugs as you have shown have shorter reach that puts the electrodes up higher and may be even into the threaded part of the spark plug hole. I would stay with a plug with longer reach that designed to fit the Model A head. JMO, Chris W. |
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