Review on ACDelco 9066N Professional Spark Plug by Knate Scarpelli

Just not the quality I expected from AC Delco. The metal terminals at the end of the connector were poorly constructed and inconsistent in shape. Some had a loose fit and others I couldn't wear. When I install the fork wires, I apply a light coat of dielectric grease to the wire from the trunk up a few inches. I then slide the boot up and then use my needle nose pliers to grab the metal clip and push down. All metal clips had a different shape. I found that I changed the shape of the clips to improve the fit, but it just didn't work with the clip design. I got Napa's Belden Edge Premium set and the difference was amazing. The Beldens clips are better shaped and all snap into place without adjustment. These Delcos went in the trash.