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I will get you the plug number, but I can say I seem to have a lot more threads in mine than you do and my heads have a tapered plug with no milled flat for a washer. I think my plug would sit way too deep in the combustion chamber from the looks of it. I will measure the thread length tomorrow.
I didn't realize you had straight plugs. That is the difference. Mine plugs are angled kind of down and in.
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