Re: 56 Pat Spark Plugs/points

Posted by JWL On 2009/10/22 12:42:07

Bowman, I believe the N-18 is not an extended plug. Champion used a "Y" suffix to denote extended core spark plugs. An N-18 would be a hotter range plug than a N-16. I think AC used an "S" suffix to denote extended core plugs. I do not know what Autolite used. At least that's the way it was ...