I use and prefer NGK's, and have had perfect success with them to date. I will even use the same plugs over and over as I have in my own engine(s) for decades. I just periodically run them to the bead blaster and knock off all the carbon, check the gap and back in they go.
For several decades I ran the same set in a 400, then two 428's, then a 455. I only replaced them because they would fit the new KRE heads.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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