Champion Spark Plugs on a L-79 Corvette?

[SSRSBOB]

J12YC is the perfect plug for that car.

My buddy runs them in his L79. Perfect heat range for today's gas. Also work in the Z28 too. 11 to one comp.

Bob

[markjohnson]

Yes Paul, you pretty much figured it out with the increased resistance making the wires break down sooner. I also wanna say that if the gap is too large with poor quality, stock type skinny plug wires that a spark can be induced from one cylinder wire to another OR just ground out to a valve cover or something, especially the consecutive-firing cylinders of #5 and #7. A friend had this problem with large plug gaps and poor plug wires on a 440-6 Pack Charger. It looked like a Fourth of July Fireworks display when the hood was open at night!

[Belair62]

I only use Champions in my lawnmower.It's a Toro.I never had much luck with them in any of my cars..

[Lynn]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Belair62</div><div class="ubbcode-body">I only use Champions in my lawnmower.It's a Toro.I never had much luck with them in any of my cars.. </div></div>

What he said. I have NEVER had a gm car that ran well with Champions.

Although, here is a bit of trivia. Anyone know what the letters AC stand for (without looking it up on the internet)?

Albert Champion...



Wayne

[danachevroletfor1967]

The only mechanic who could get my 1969 Z/28 to run right said that he wouldn't use Champion plugs in his lawnmower. He replaced the Champions with AC R43's. I used Champions in my 1965 Dodge Coronet though all the time, and they seemed to work fine in it. Maybe Champions just work better in Mopars than in GM's.

[Lynn]

Back when I had the shop I only used AC's in GM, used Autolite (when available - if not then Motorcraft) in Fords, and Champions in Mopars (when I had to work on one - I hate Mopars).