Spark plug recomendation - CLASS RACER FORUM

11-23-2012, 08:02 PM

#14

KRatcliff

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Re: Spark plug recomendation

Quote:

Originally Posted by tj310

What # Autolite ? ---Trevor

For the original poster's application I would use an Autolite AR24 (5/8' .460 reach). It is in the middle of the heat range. AR25 is hotter and AR23 is colder.

Index it and open the gap up to about .045 if you are using a short duration/intense racing ignition system like a MSD 7AL2. YMMV.

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