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Yep Champions are junk, thats why they were the OE plug when these cars were new. I think your problem is running a resistor plug in that motor in the first place. Find a non-resistor plug in the heat range you want and try that. I run old NOS J11Y Champions and have never had a problem. But you pick any manufacture you want and find out for yourself which one you like because anytime somebody asks about spark plugs on here you get a different answer. Its about like asking which beer is the best.



the champions that were installed in the 60's/70's are a much better plug than the new champions , never had good luck running that rj12 in anything either .



My GTX with a fresh 440, about 9.5:1 compression, stock everything except the Mopar 272 cam fouled the RJ12YCs like crazy. With the timing set at 6 degrees or so initial I think it would have been fine, but as soon as I advanced it to about 12 or 13 you could visually see the dark smoke start to pour out of the exhaust pipes. I think theyre probably good if you tune your car to stock specs/

The Champions I put in my 273 to replaced the fouled Autolites in it fouled up within two days. I changed the points, condensor, rotor, cap, adjusted the timing to a tad more intial than stock. Pulled the plugs two days later to change them (I had been driving the car) and they looked like I just pulled them fresh out of the box. Tune them to stock specs in a stockish engine and the Champions are probably perfect. Thats why the factory liked them.

Last edited by GTX MATT; 06/14/08 11:20 AM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street