Do they work?
I have a total of 6 Champion H-14 primer cup spark plugs and i have had 4 in my 14 for at least 8 or 10 years! In the old days or even now if you use a heavy oil i think they would help?? Back in the day liquid either was used and with a drop or two you might get stone cold free starts?? Often i'll leave my hood open and ask people if they have ever seen plugs like them?? Bud in Wheeler,Mi.