what spark plugs to use

68 Coronet RT said

I wouldn't put Champion plugs in a lawn mower. I have used nothing but NGK, best plug on the market hands down !

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I agree. An old Mopar engine builder told me to throw my Champion plus away 45 years ago, and I did. Autolites only for my Son and I but I did buy some NGK's for the nitrous build I am putting together.