Regitar USA Rotor f/Mercruiser GM V-8 engines w/Delco HEI 1998 Newer (Except MPI Engines with 555 ECM) [RMN009]Rotor for Mercruiser GM V 8 engines with Delco HEI 1998 & Newer (Except MPI Engines with 555 ECM) Rotor for Mercruiser GM V 8 engines with Delco HEI 1998 & Newer (Except MPI Engines with 555 ECM). Engine Brand: Mercury Mercruiser Fitment: Mercruiser GM V 8 engines with Delco HEI 1998 and newer (except MPI engines with 555 ECM). Brochure (pdf)