Hemi Engine Spark Plug

The Mopar Cylinder Block Plug (part number 53032221AA) is a genuine OEM replacement designed to maintain engine integrity in Hemi applications. This component serves as a crucial plug for cylinder blocks that are not equipped with the Multiple Displacement System (MDS), ensuring that all necessary passages are sealed correctly. It is explicitly stated that this plug is for engines without the MDS system. This cylinder block plug is compatible with a range of Hemi engines, including 5.7L, 6.1L, 6.2L, and 6.4L variants. The official product notes specify compatibility with various 5.7L V8 Hemi engines (CNG and VVT), 6.2L Supercharged Hemi V8 SRT and HO engines, and 6.4L V8 SRT Hemi engines. Additionally, it is noted for use with the 6-speed automatic 66RFE transmission. While specific vehicle fitment tables were not fully accessible due to website restrictions, search results indicate this plug is suitable for numerous Dodge, Jeep, and Ram models from 2003 to 2026, particularly those featuring Hemi engines. Applications mentioned include R/T, Yellow Jacket, and 392 Hemi Shaker trims, as well as various 4x4 configurations. It is a direct replacement part, intended to provide the same fit and function as the original equipment.