My buddy Hal looked at it today. I was pressing to have him turn down a socket in his lathe. He cautioned me on the sidewall clearance and brought up the possibility of breaking a fork and getting the plug stuck. We looked thru the NGK book and can't find these plugs in a 5/8 cap. I want to run a heat range 8, non-projected, resistor, iridium plug. The DSM plugs don't fit so what are my options? Anyone have a Denso , Autolite, or Champion book they can ref for an alternative plug?


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