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Spark plugs for 33 Rockne 10 ?


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The original was a metric thread Champion heat range or model 7.

 

This corresponds to NGK 7, Pulstar 1, Denso 2, Bosch 5.

 

Here is one:

http://www.ebay.com/itm/VINTAGE-NOS-Champion-7-Spark-Plug-18-mm-1-Hex-Box-Paper-/292057192391?hash=item43fff717c7:g:h2YAAOSwuLZYygUj

 

So you want an 18 mm plug with heat range 7 is my guess.

 

Here you go:

http://www.sparkplug-crossreference.com/convert/CHAMP_PN/7

Edited by Spinneyhill (see edit history)
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