Not Ranked
The first NGK plugs I ever saw were in the 1972 Yamaha snowmobile my dad bought for me brand new. In the last 48 years, I've made them 1st choice for every application from my string trimmer to my Harleys to my v10 F250. O2 sensors, and Duramax glow plugs too. Never a single problem. They will go in both of my Windsor-powered Cobras, no doubt.
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