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Discussion Starter #1
just switched to alky should i go hotter or colder plugs, it's a n/a 13-1 408sbc. i was using ngk 8's whats yalls honest opinions
 

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Discussion Starter #4
i've read about the gap was figuring on under 30 sounds good i had an extra set of plugs so i don't have to buy more !
 

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I think it depends on what battery one runs .... a 12v Vs 16v and what ignition system too.

I ran a wider gap with the 16v battery (.040) than I did with the 12v (.025) ..... same MSD-7A and Pro-Power coil. Never any issues.
 

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Discussion Starter #7
i'm a 12v 7al2 with pro power, i'll try the 25-30
 
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