Quicksilver 8M6001253 Rotor - MerCruiser V-8 Engines Made by General Motors with Delco High Energy Ignition (HEI) Systems High strength to weight ratio rotor for durability and resistance to thermal cracking Produced to Meet Mercury marine original equipment Manufacturer specifications to best protect your mercuries engine Coated brass rotor blade is designed to resist rift interference with onboard electronics Use only with Quicksilver distributor cap 808483T3