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Spark plug gap for modified Cobra Jet

December 28 2001 at 1:29 PM
Morgan  (no login)

I am getting ready to drop a recently built 428 CJ into my 67 GT-500. One question I have is what should the Spark Plug Gap be? I am running champion plugs recommended by Edelbrock in their aluminum heads with a Blue Thunder single four intake and 750 Holley with vac secondaries. The motor will also be equipped with FPA Tri Y's and I have a Pertronix ignition in the stock distributor and Pertronix coil along with 8.8 spark plug wires. I currently have the gap set at 37, stock is 35. Welcome all related input.


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December 28 2001, 1:40 PM 

I'm running .055" with a MSD 6AL and Blaster coil. The hotter the fire, the more gap you can run. Your Pertronix should be a fairly hot fire from what I've read. Try .050" and see how that does.

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