6.1L/6.4L Hemi Iridium IX Spark Plug Set

The Whipple WSP-LZTR7Aix-13 spark plug set provides a direct-fit replacement for 6.1L and 6.4L Hemi engines, offering enhanced performance and longevity. These spark plugs utilize Iridium IX technology, which is known for delivering outstanding acceleration, improved fuel efficiency, and exceptional durability. Each spark plug in this set of 16 features a 0.984-inch reach and a tapered seat, ensuring proper seating within the cylinder head. The pre-gapped size is set at 0.052 inches, with a standard plug length and a 5/8-inch hex size for installation. The electrical terminal type is non-removable, and they are designed with a single ground strap for reliable ignition. The resistance rating is specified as 5000 82. These spark plugs are specifically recommended by Whipple for use with their supercharger systems on Hemi 6.1L and 6.4L applications. While the LZTR7AIX-13 is the recommended part number, some sources suggest a pre-gap reduction to 0.032 inches when used with Whipple superchargers, which may require checking specific installation instructions or consulting with a performance specialist.