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Cross Reference??
I've also built a Ford Racing 514 from short block. I don't have an NGK part number, but Ford Racing recommeded I use Motorcraft AGS-32C spark plugs. They like this heat range for the 514 engine. Perhaps you could find a cross reference to an NGK number? I can't give you any feedback on this plug because the car's not on the road yet. All I can confirm is that the engine runs with these plugs!
Good luck!
Chuck Miller
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