Best spark plug for a 92 4.3 V6? I would rather not use the copper OEM ones so what’s a nice upgrade that’ll work?
The copper OEM ACDelco CR43TS are the best...
But if you really want to run something else I'd probably go with the ACDelco Rapidfire 1 Platinums.
https://www.rockauto.com/en/moreinfo.php?pk=89909&cc=1031263&jsn=451&jsn=451