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Allis Chalmers Discussion Forum
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1941 Allis Chalmers Model C Spark Plugs

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Tom Dooley

05-14-2005 10:08:38




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I can't locate AC 45 spark plugs for my AC C. No one seems to be able to tell me what plug will cross reference with this plug. The tractor is still 6 volt,with a mag. Any help would be welcome!! Thanks Tom




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Rod (NH)

05-14-2005 10:18:46




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 Re: 1941 Allis Chalmers Model C Spark Plugs in reply to Tom Dooley, 05-14-2005 10:08:38  
Hi Tom,

AC45 crosses directly to NGK B4. See this cross reference. I've been using the NGK plugs for quite a few years now and have had excellent luck with them.

third party image Rod

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Tom Dooley

05-14-2005 10:29:01




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 Re: 1941 Allis Chalmers Model C Spark Plugs in reply to Rod (NH), 05-14-2005 10:18:46  
Rod; Thank you for your quick come back!! I have read your replies for help from many other guys,and I have down loaded the information you provided them for future reference. Thanks Tom



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Glen in TX

05-16-2005 19:46:15




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 Re: 1941 Allis Chalmers Model C Spark Plugs in reply to Tom Dooley, 05-14-2005 10:29:01  
I have a set of 4 new AC R45s on the shelf but not the regular 45. I may can get them? Use to keep them. AC and other plug companies are getting bad about dropping a lot of the non resitor plugs now. Also can use AC 46, Champion J8, J8C, RJ8C. Another brand I like are the Nippodenso in a non resistor plug and to replace the 45 you would use a W14-U or a W9-U for the 46.



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