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The 60s/70s Toros with the Tecumseh engines called for Champion J-8 spark plugs. The more recent equivalent is the Champion J-8C. But, I have a 10-pack of NOS Champion UJ-8. Are they the same as the J-8 ? What's the story on the two? Was one produced before the other? ??? Thanks for any info.
 

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J8C Plug Specifications
Center Electrode

Ground Electrode


UJ8 crosses to an RJ8C:
RJ8C Plug Specifications

Center Electrode

Ground Electrode


Going from memory I think the only difference with the old J-8 was a longer porcelain top like an automotive plug and no resistor where the newer replacements is a stubby version. (Edit: the CJ8 might be the stubby version, thinking the 'C' on the front stood for 'compact'. Some of the older ones did have a tip that would unthread off for attaching plug wires with eyelets instead of a clips. That might account for the difference too.)

Champion has a pretty slick sight. You can even measure your old plug and enter them in the reverse engineer section to find a replacement.

http://www.championsparkplugs.com/Search.aspx?ptn=Spark+Plug
 
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