The Champion plugs in my 367 are circa 1999 I think. RN12YC or something. Whatever they are, they have over 100,000 miles on them. Last time I looked at them was in about 2004/5 the summer I took a little trip to the dragstrip. Being as how they were already 5ish years old, I bought a new set. But when I pulled the aged ones out on preparation-day, they looked so new, I put them back in. The New ones, now more than 15 years old, are in the tune-up kit, still in the trunk.......
