What are the correct spark plus for '61 283/230? Are they judged?
'61 spark plug
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Re: '61 spark plug
AC 44, long out of production. Yes, they are judged, and the least deduction is to use an AC plug, but all are now resistor type. The best from a functional standpoint is the R45, which is one heat range hotter than OE.
Denso and NGK make equivalents to the 45 (non-resistor), W14-U and B4, respectively.
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