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Anyone out there with GT40 heads? I've got a GT40 crate motor with aluminum heads, Air Gap and Demon 625. Just wondering what plugs would be best. And what do you normally gap them to.

Thanks.
 

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I'm using Auto-lite 3924 plugs with a .045 gap.
Make sure your ignition system is up to the task with a plug gap over .035.
 

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I'm also running Autolite 3924 in the Fastback (AFR 185s). Does the GT-40 heads use a tapered seat or a flat seat with washer?
 
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