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i have a 331 ford with a gt4785 i street drive the car alot anywhere from 15 to 30lbs of boost . trying to find the best plug for my car it made right around 1000 on the dyno .any help thanks
 

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What heads? I do a lot of street driving and use irridium plugs. They run cleaner than the retracted tips most racers are using.
 

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I like the NGK's -9 or -10's in my cars with the non projected tips.
 

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NGK cheap and easy to get . We run 8s to 10s nonprojected. Make 2000 hp for less than 2$ a plug . Read trash, replace hard to do with a 5$ plug..
 

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briskusa.com they have alot of options and price levels but we use alot of their silver plugs. They last a long time, seem to make a little extra power on most cars and you can tell by looking at them that they are quality. Give us a call if you want to order some they aren't too expensive.
 

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NGK 10s are going to be your best bet... R5671A-10 is the part number, not sure on the 4 digit stock number. They are couple a bucks each :D
I'm not sure if they fit those cylinder heads honestly.
 
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