Review on Denso SK20HR11 Iridium Spark Single by Jose Strong

The DENSO Iridium 3421 spark plug featured in the ad has clear 'DENSO' and 'Japan' stamps on the base ring to match the DENSO genuine part. However, the forks I received are stamped 'Assembled in USA with Parts from Japan and USA' on the base ring, not as advertised. The word "DENSO" on the white insulator is shaded and appears lighter on the original DENSO part as shown in the promotional photo. However, the spark plugs I received have "DENSO" written in solid dark print which does not match the original DENSO part (see several online guides for identifying original DENSO iridium spark plugs). Finally, these plugs are said to have a default clearance of .044 inches. The spark plugs I received had variable gaps and none of them met the pre-gap standard. All of them had gaps no larger than 0.040 inches. there were two packs of 4 for a set of 8) and at least two boxes were visibly open (the tabs on the box flap were bent).