The Selectors plug into the retard module receptacle of any MSD Timing Controls. 1964-chevrolet-biscayne-esi2503226 Engine Oil Pan - Street

Engine Oil Pan - Street / Strip - Rear Sump - 6

Water Pump - Mechanical - Crank Driven - Aluminum - Clear Anodized / Natural - Midget / Sprint Car - Each

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The Selectors plug into the retard module receptacle of any MSD Timing Controls. 1964-chevrolet-biscayne-esi2503226 Engine Oil Pan - StreetThe Retard Module Selectors allow you to select between 12 retard amounts with the turn of a dial.