Denso Spark Plug Standard - 3201

These are performing properly in a Mitsubishi project car. This is significant because I ended up with this vehicle after one of the previous spark plugs had come loose and destroyer the threads in that hole on the right head. The previous plugs had the same thread diameter, pitch, and depth - but they were threaded all the way to the tip. On these replacements, the threads stopped one turn from the tip. Almost all of the prior spark plugs were loose, so it looks like they did not seat properly. A threaded sleeve installed in the bad hole, one new coil, these plugs, and this car is again running on all six.