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hey guys seeing if you could help or give advice im running champion rc12yc sparkplugs and i want to go with 2 steps colder plugs all the part stores around me look at me like im a weirdo :eek: could you help :yes: i dont know if this will help but this is the demension of the plug. 14mm .750'' reach, 5/8'' hex.
 

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I use NGK's like these for most of my driving, but if you spend most of your time on the street go with an 8 or 9. They are a little harder to find, but the larger NAPA stores stock them for about $2--you won't find race plugs any cheaper.

NGK Spark Plugs #739-R5672A-10

Racing Non-Resistor Spark Plug
14mm x 3/4" Reach
5/8" Hex
Projected
Gasket seat
V-groove center electrode
 
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