Premium Replacement Rotor for Mercruiser Inboard Engines with TEI Ignition This rotor fits GM (V8) 5.0, 5.7, and 7.4L engines with Mercruiser Thunderbolt Electronic Ignition. Replaces: MERCRUISER Rotor 13524A1 MERCRUISER…Continue readingARCO Marine Premium Replacement Rotor f/Mercruiser Inboard Engines w/TEI Ignition [DR004]