What plug best for '37 (21 stud)

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Guest

Guest
What plug do you guys recommend for my '37 engine for 'normal'street use? How about NGK?
 
I've been using Autolite 386 for a couple of years with good success. NGK A6 would be a good choice, but I read here yesterday that the A6 number has changed. You would have to do some research for the new number. Champion's haven't worked good for me lately.
 
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