Review on NGK DPR8EA 9 Spark Plug Pack by Joe Meyer

Have been using NGK for 35 years. I've never had a bad fork from them. Copper core = excellent spark. You can buy more expensive plugs that might last longer, but when you look at conductors, copper comes second. silver first. Some people think Iridium connectors are better, but that's not always the case. For example: Iridium might last longer, but no better than a spark. The automotive industry uses them for durability, not spark quality. If you're installing forks in your car and need to loosen the dog bones and jack up the engines to do it, you may need a longer life fork. If you want spark quality, you won't have a hard time changing it. copper core.