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

Yeah that could be a problem

good luck with your repairs!

as far as heat range, i'd stick with stock until it proves to need to be changed. being a long reach gasket type plug, i just wonder who determined the Autolite 3923 to be correct to begin with?

i use this reverse engineering tool to find alternate plugs for various cars,

https://www.sparkplugs.com/Search.aspx?ptn=Spark+Plug

they also have heat range charts on the page. IIRC they say Autolite doesn't use a standard heat range code so it's hard to cross reference different types of plugs?

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