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This MSD extra duty distributor cap is designed with performance in mind and are molded form high quality, voltage insulating alkyd and use low resistance terminals.
The MSD-8437 Cap fits all of the MSD Distributors that use the GM HEI style cap (MSD-8433). It will also fit GM Distributors that use a "window" style cap.
Fits MSD distributors 85551, 85555, 8361, 85501, 85505, 85561, 8356, and 8360