[Stallion18]

Im just curious what you track oriented guys run as far as spark plugs and gaps. Im currently running Autolite Double Platinums (APP25s) in my Edelbrock RPMS. I think they are gaped at .040 or .045 I cant remember.

Im curious about the new ZEX plugs as well as the Autolite Racings, and hell anyone using NGK Iridiums?

 

[johnpro]

I used the NGKs and saw no gain or loss AT ALL from my Autolite 45's. Times at the track were identical. So I went back to the cheaper Autolite 45's. I gap them at .055 because I have low enough compression (9.3:1) and full MSD ignition.

 

[roadracer]

Here's a thread for reference

 

[autoxsteve]

IIRC, I'm using the Bosch's Roadracer refers to.

Flawless performance and their construction is impeccable...

 

[c6fastback]

I thought most of the aluminum heads were using Autolite or 3923 or 3924 not the 25's. Also AR3923 with cutback electrode .