setauketjeff
Settling In
1971 440 MGM Every stoplight is a staging light!
Posts: 230 
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Post by setauketjeff on Nov 7, 2017 8:57:43 GMT -5
Is anyone using anything other than RJ12YC .35 Gap on their 440 HPs? I exclusively used these on my 71 383 too for years and am wondering about other's experiences.
Thanks Jeff
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Post by fst440 on Nov 22, 2017 21:29:42 GMT -5
I use ngk br6s in my high compression 440. My engine builder picked these out, they run good for this combination. I used ngk xr5 in my stock/hot rod 440 before, they ran good. I've tried rj12yc, I had good luck with those also. Only plugs that didnt work well for me were ac delco and autolite in my 440. I'm a fan of ngk myself, being a Nissan tech by trade, that's what they mostly use. Also in my dirt bikes, run good there also.
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Post by bwood1957 on Jun 17, 2021 17:25:20 GMT -5
On my 340 I use Autolite 65 torqued to 30 ft.lbs and Gap = .035...engine runs great..!
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Post by odzking on Jun 18, 2021 8:51:40 GMT -5
I went with NGKs on both my cars after many recommended them and said Champions were no longer any good. But frankly I see no difference from the Champions. Next go-round I'll be back to the Champions for both the 383 and 400.
I would stick with those as it is what Mopar's came with, just my 2 cents.
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