Review on π Enhanced Performance with Motorcraft SP537 Spark Plug: A Game-Changer for Your Vehicle! by Edward Noble
Not pre-gapped as suggested by Amazon
Be careful, they are not pre-gapped. Some people say 0.028 but mine was closer to 0.04+. I made them believe they were clamped and could feel a slight reduction in performance. I thought and I pulled them out and measured them. They have been turned off. The car drove normally, there were no misfires, but there was a lot of play. Just for info
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