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Shin,
I can't really comment on the NGKs as I have never used them but I have used several other types in both my big block and stroker and kept coming back to the Autolites. I could see no gains at all in performance and the extra money was just wasted in my case. Also if you are runnig a Jacobs or MSD don't use any type of Platinum plug. Just the regular electrode type will work best.
Ron
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