Ngk spark plugs

Dec 5, 2006
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Going to be changing out my plugs and want to try out what ngk has to offer, currently running h/c/i set up and the heads are gt40X heads , right now iv got autolite 2924's in the car .

What part # for the ngk am i looking for with these heads and will they be 1 step colder than a stock plug. Any help is appreciated .
 
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I have NGK plugs in my AFR 185 heads. they have a .75 reach so I dont know if you need that lenght but, stock heat range is a 5 in NGK. Im running a 7 which is 2 steps colder. BKR7EKC-N is the part number Im using. They have 2 ground straps instead of one & if you want 1 heat range cooler you would put a 6 in the part number instead of the 7. hope that helps.