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

the Edelbrock page is messed up after their last remodel, here's a link to a complete catalog that works

https://edelbrock-files-v1.s3....X60HkP0hXjIP4W6QdFr8

'stock' heat range should act a little on the cold side if alloy heads really dissipate heat that much better? Summit can also be a good reference page, find your heads and open the instructions link. calling is good too, more people should pick up the phone!

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