Review on 🔥 Boost Performance with Autolite 3924 Spark Plug Copper Core (4 Pack) by Brad Knierim

Don't forget to adjust the spark gap! First I install without adjusting the gap. Machine runs, but with poor acceleration (weak performance). Then I pull the old ones out of the bin, set the spark plug gap, then put them back in, wow! the car runs like a new engine. The Cooper spark plug actually has better conductivity than platinum; hence better performance. Only this cooper has a shorter lifespan. But at that price I wouldn't mind changing them every few years.