Replacement ignition rotor and cap kit 805759T3 is for use on marinized, V8 General Motors engines with Thunderbolt IV and V HEI ignition systems. Mercury Marine’s passion for performance is matched by your drive for the new, the unknown. Our legendary reliability and durability let you boldly embrace your next adventure—large or small—knowing you’re backed by the best quality design, engineering, and materials.Key Features Coated brass rotor blade is designed to resist RFI interference with onboard electronics Cap is made from a blend of PBT and PET plastics for increased strength, stiffness and resistance to warpage Replace worn or damaged rotor and cap to ensure optimum spark delivery to your engine for peak performance Easy-to-replace rotor, gasket and cap Fitment / ApplicationFits GM V-8 engines with Thunderbolt IV & V HEI ignitions