Spark plug advice
I run Champions in my Mopar's . Just sayin. I know there are probably better quality plugs out there ( like maybe NGK or Bosch) but I don't like the heat ranges they build. If you do try a non-Champ plug make a run and pull a couple plugs to read how they are burning. I reduced compression on my freshly built 273 and tried a Autolite plug. I had a rough/rich idle issue and come to find out the plug was a heat range colder than the original N9Y Champions. I bumped up a couple heat ranges and all is well.
