Quicksilver 8M6001253 Rotor-DistributorQuicksilver Rotor 8M6001253 fits marinized General Motors V8 engines with Delco made high energy (HEI) ignition systems. See your owner's manual for replacement information and directions.Application : Fits GM V-8 engines with Delco HEI ignition. High strength-to-weight ratio rotor for durability and resistance to thermal cracking; Coated brass rotor blade is designed to resist RFI interference with onboard electronics; Use only with Quicksilver distributor cap 808483T3; Replaces: 863122