The best choice 👌
Although, this is still a "two piece" plug design, it is (in my experience) the best stock replacement plug, for the 3v modular engine. No misfire, or shortened life issues with these plugs. After 40k miles, even the old plugs, only had gaps out of tolorance. The gap, with these plugs, is non adjustable. Necessitating replacement.
Some people experience severely burned, or trashed ceramics, or engine damage. I would submit that regular maintenance, or close monitoring of engine performance/efficiency, will preclude these problems.
In summery; although the two piece plug was probably not one of Ford's best ideas, the SP514 is (imho) the best stock replacement, currently available. Exceptions being hotter coil spark, or forced induction applications, that would require smaller gaps, or cooler plugs.
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