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Discussion Starter · #1 ·
I've seen Holley heads mentioned before so here goes. I picked up some used heads for a mild build and was wondering what spark plugs I should use. The part # is 34R-12111. I think. If anyone hase some specs for me that would be great!
 

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They use the typical 14mm, .750" reach gasketed plug most all aftermarket aluminum heads use....Autolite 3924 for example, or NGK R5671A-5, or -6, or -7.

You can cross reference to any other brand off of that.

With NGK, the higher the dash number at the end of the string, the colder the plug...-5 is stock heat range roughly, -6 aznd -7 are common naturally aspirated performance use, -8 or higher for turbo, supercharge, or nitrous applications or endurance running.
 
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