Reply to "The spark plugs in my new Pantera (5253) are running black. I am seeking advice concerning how to proceed."

@4vandproud I looked up specifications on the Edelbrock Victor Jr. aluminum heads and they call for a 14mm gasket seat plug with a 3/4” reach. From what I gather on Autolite’s heat range, the 3923 has a heat rating of 3, and the 3924 has a heat range of 4 so it’s hotter. I’m just  naturally aspirated EFI and the 3924 is a mostly “stock” style plug from what I’m reading. 

I might put a call into Edelbrock for their input as it’s their heads on the car.

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