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Hey guys i got a set of dart steel heads they are about 15 or so years old and i think they are 200cc maybe 180cc but they are 2.02 / 1.60 no port work done. What spark plug should i use ? I was told to use a (race) Autolight 134. The heads are going on a 383, I do have a MSD setup. It will see a lot of street time just a few times a year at the track. Thanks for any help......novajim
 

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assuming they take a peanut plug you can use an autolite 133. That is the recessed tip one, good for nitrous use. You can use the autolite 24 that is the extended tip. Or cross reference to an NGK plug.
 

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If it's a .460" reach, tapered seat.
NGK-UR5 will cover MOST applications.
 
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