Can anyone confirm what the equivalent NGK, Denso, Champion and/or Autolightspark plugs would be to the AC 46? I read on another thread that NGK B4 would be equivalent to a AC 45 (maybe also AC 46?). NGK also makes a B2, but unsure if that would be too hot or even fit...
ACDelco makes an R46SZ plug with a .060 gap. Could this be safely bent down to .035 to work for my 1959 FI?
All in all, I'd like to know the closest plug to the old AC 46 to use for my 1959 FI car...
Thanks very much!
ACDelco makes an R46SZ plug with a .060 gap. Could this be safely bent down to .035 to work for my 1959 FI?

All in all, I'd like to know the closest plug to the old AC 46 to use for my 1959 FI car...

Thanks very much!
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